+0

0
1659
3
+371

2/3n - 2/3 = n/6 + 4/3

Apr 20, 2016

#1
0

Solve for n:             (2/3)n - 2/3 = n/6 + 4/3. I have taken the 1st. term as shown
(2 n)/3-2/3 = n/6+4/3

(2 n)/3-2/3 = (2 n-2)/3:
(2 n-2)/3 = n/6+4/3

Put each term in n/6+4/3 over the common denominator 6: n/6+4/3  =  n/6+8/6:
(2 n-2)/3 = n/6+8/6

n/6+8/6 = (n+8)/6:
(2 n-2)/3 = (n+8)/6

Multiply both sides by 6:
(6 (2 n-2))/3 = (6 (n+8))/6

6/3 = (3×2)/3 = 2:
2 (2 n-2) = (6 (n+8))/6

(6 (n+8))/6 = 6/6×(n+8) = n+8:
2 (2 n-2) = n+8

Expand out terms of the left hand side:
4 n-4 = n+8

Subtract n from both sides:
(4 n-n)-4 = (n-n)+8

4 n-n = 3 n:
3 n-4 = (n-n)+8

n-n = 0:
3 n-4 = 8

3 n+(4-4) = 8+4

4-4 = 0:
3 n = 8+4

8+4 = 12:
3 n = 12

Divide both sides of 3 n = 12 by 3:
(3 n)/3 = 12/3

3/3 = 1:
n = 12/3

The gcd of 12 and 3 is 3, so 12/3 = (3×4)/(3×1) = 3/3×4 = 4:

Apr 21, 2016
#2
+1904
0

$$\frac{2}{3n}-\frac{2}{3}=\frac{n}{6}+\frac{4}{3}$$

$$\frac{6}{9n}-\frac{6n}{9n}=\frac{n}{6}+\frac{4}{3}$$

$$\frac{6-6n}{9n}=\frac{n}{6}+\frac{4}{3}$$

$$\frac{6-6n}{9n}=\frac{2n}{12}+\frac{16}{12}$$

$$\frac{6-6n}{9n}=\frac{2n+16}{12}$$

$$6-6n=\frac{9n\times(2n+16)}{12}$$

$$6-6n=\frac{3n\times(2n+16)}{4}$$

$$4\times(6-6n)=3n\times(2n+16)$$

$$24-24n=3n\times(2n+16)$$

$$24-24n={6n}^{2}+48n$$

$$24={6n}^{2}+72n$$

$$4={n}^{2}+12n$$

$$40={n}^{2}+12n+36$$

$$40={(n+6)}^{2}$$

$$±2\sqrt{10}=n+6$$

$$-6±2\sqrt{10}=n$$

$$n=-6±2\sqrt{10}$$

$$n=-6+2\sqrt{10};$$  $$n≈ 0.3245553203367587$$

$$n=-6-2\sqrt{10};$$  $$n≈-12.3245553203367587$$

.
Apr 21, 2016
#3
0

n/6+3=12

Apr 26, 2016