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3x - 5x = 20 - 6
-2x = 14
2x = -14
x = -14 / 2
x = -7
x + 15 = -7 + 15
= 8
3x - 5x = 20 - 6
-2x = 14
x = 14/-2
x = -7
x + 15 = (-7) + 15
= 8