3x+9=x-7 - solution

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Solution for 3x+9=x-7 equation:

x in (-oo:+oo)

3*x+9 = x-7 // - x-7

3*x-x+7+9 = 0

2*x+16 = 0 // - 16

2*x = -16 // : 2

x = -16/2

x = -8

x = -8

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