7=-a+2a+7

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Solution for 7=-a+2a+7 equation: 


a in (-oo:+oo)

7 = 2*a-a+7 // - 2*a-a+7

a-(2*a)-7+7 = 0

a-2*a-7+7 = 0

-1*a = 0 // : -1

a = 0

a = 0

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