How do you solve 9a + 15 =10a - 7?

1 Answer
May 31, 2016

a=22

Explanation:

Given,

9a+15=10a-7

Subtract 9a from both sides.

9acolor(white)(i)color(red)(-9a)+15=10acolor(white)(i)color(red)(-9a)-7

15=a-7

Add 7 to both sides.

15color(white)(i)color(red)(+7)=a-7color(white)(i)color(red)(+7)

a=color(green)(|bar(ul(color(white)(a/a)color(black)(22)color(white)(a/a)|)))