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8x - 3x = 7 + 15
5x = 22
x = 22/5
7x + 3 = 5x + 9
7x - 5x = 9 - 3
2x = 6
x = 3
-4x + 7 = 3x - 8
-4x - 3x = -8 - 7
-7x = -15
x = 15/7