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- 10 + 15 = 5x + 5
5 = 5x + 5
- 5x = 5 - 5
- 5x = 0
x = 0/-5
x = 0
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13x - 9x = 28 - 4 + 16
4x = 24 + 16
4x = 40
x = 40/4
x = 10
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25x + 30 = 21x + 70
25x - 21x = 70 - 30
4x = 40
x = 40/4
x = 10
-----------------------------------------------------
9x + 50 - 2x = 120 + 20 - 20
7x + 50 = 120
7x = 120 - 50
7x = 70
x = 70/7
x = 10
--------------------------------------------------------
13x - 45 + 80 = 6x + 245
13x + 35 = 6x + 245
13x - 6x = 245 - 35
7x = 210
x = 210/7
x = 30