-9=-7a+5a+7

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Solution for -9=-7a+5a+7 equation: 


a in (-oo:+oo)

-9 = 5*a-7*a+7 // - 5*a-7*a+7

-(-7*a)-(5*a)-9-7 = 0

7*a-5*a-9-7 = 0

2*a-16 = 0 // + 16

2*a = 16 // : 2

a = 16/2

a = 8

a = 8

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