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5x = -15 + 20
5x = 5
x = 1
2) 3 (x - 5) = 7x + 1
3x - 15 = 7x + 1
-15 - 1 = 7x - 3x
-16 = 4x
x = -4
3) 6x - 3 = 2x - 11
6x - 2x = -11 + 3
4x = 8
x = 2