-6a-9=-13-7a

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Solution for -6a-9=-13-7a equation: 


a in (-oo:+oo)

-6*a-9 = -(7*a)-13 // + -(7*a)-13

7*a-6*a-9+13 = 0

a+4 = 0 // - 4

a = -4

a = -4

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