6m-9+7m=69 - solution

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Solution for 6m-9+7m=69 equation:

m in (-oo:+oo)

6*m+7*m-9 = 69 // - 69

6*m+7*m-69-9 = 0

13*m-78 = 0 // + 78

13*m = 78 // : 13

m = 78/13

m = 6

m = 6

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