4=-a+3a-4

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Solution for 4=-a+3a-4 equation: 


a in (-oo:+oo)

4 = 3*a-a-4 // - 3*a-a-4

a-(3*a)+4+4 = 0

a-3*a+4+4 = 0

8-2*a = 0 // - 8

-2*a = -8 // : -2

a = -8/(-2)

a = 4

a = 4

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