7=-a+3a+3

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Solution for 7=-a+3a+3 equation: 


a in (-oo:+oo)

7 = 3*a-a+3 // - 3*a-a+3

a-(3*a)-3+7 = 0

a-3*a-3+7 = 0

4-2*a = 0 // - 4

-2*a = -4 // : -2

a = -4/(-2)

a = 2

a = 2

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