-9+6x+x=12 - solution

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Solution for -9+6x+x=12 equation:

x in (-oo:+oo)

6*x+x-9 = 12 // - 12

6*x+x-12-9 = 0

7*x-21 = 0 // + 21

7*x = 21 // : 7

x = 21/7

x = 3

x = 3

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