Quote: The sum of -4 and 8 times a number is multiplied by 3. The result is 15 less than 25 times the number. What is the number?
Let the number be x
the first sentence results in 3(-4 + 8x)
the second sentence is (25x - 15)
and these two are equal
3(-4 + 8x) = 25x - 15
-12 + 24x = 25x - 15 ; add 15-24x to both sides
3 = x
+6251 
