8n-(2n-3)=12
8n -2n + 3 = 12
6n + 3 = 12 subtract 3 from both sides
6n = 12 - 3
6n = 9 divide both sides by 6
n = 9/6
n= 1 1/2
.5d-3d+5=0
-2.5d + 5 = 0 subtract 5 from both sides
-2.5d = -5 divide both sides by -2.5
d = -5/-2.5
d = 2
-(w+5)=-14
-w - 5 = -14 add 5 to both sides
-w = -14 + 5
-w = -9 multiply both sides by -1
w = 9
2/3+n+6=3/4 subtract 6 2/3 from both sides
n = 3/4 - 6 2/3
n =3/4 - 20/3 GCD of 3 and 4 is 12
n =9/12 - 80/12
n = -71/12
n = - 5 11/12
a/20+4/15=9/15
Solve for a:
a/20 + 4/15 = 3/5
Put each term in a/20 + 4/15 over the common denominator 60: a/20 + 4/15 = (3 a)/60 + 16/60:
(3 a)/60 + 16/60 = 3/5
(3 a)/60 + 16/60 = (3 a + 16)/60:
(3 a + 16)/60 = 3/5
Multiply both sides of (3 a + 16)/60 = 3/5 by 60:
(60 (3 a + 16))/60 = (60×3)/5
(60×3)/5 = (60×3)/5:
(60 (3 a + 16))/60 = (60×3)/5
(60 (3 a + 16))/60 = 60/60×(3 a + 16) = 3 a + 16:
3 a + 16 = (60×3)/5
3 a + 16 = 12×3
12×3 = 36:
3 a + 16 = 36
Subtract 16 from both sides:
3 a + (16 - 16) = 36 - 16
16 - 16 = 0:
3 a = 36 - 16
36 - 16 = 20:
3 a = 20
Divide both sides of 3 a = 20 by 3:
(3 a)/3 = 20/3
3/3 = 1:
a = 20/3
