30 + 5x = 15 + 10x 30 = 15 + 5x 15 = 5x x = 3
39 = 5x + 9 5x = 39 - 9 5x = 30 x = 30 / 5 x = 6
x=6 y=30
-30
5x - 7 = 23 .....+7....+7 5x=30 --- --- 5.....5 --->(x=6)<---
30 + 5x = 15 + 10x 30 = 15 + 5x 15 = 5x x = 3
39 = 5x + 9 5x = 39 - 9 5x = 30 x = 30 / 5 x = 6
6
X=-4
5x + 20 = 4x +30 5x - 4x = 30 - 20 x = 10
30
45
-5x-5=25 -5x=30 x=-6
5x+10=40 5x+10-10=40-10 5x=30 5x/5=30/5 x=6
x=6 y=30
-30
-5x + 30 = 20 -5x + 30 - 30 = 20 - 30 -5x = -10 -5x / -5 = -10 / -5 x = 2