-90=4n+7n+9

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Solution for -90=4n+7n+9 equation: 


n in (-oo:+oo)

-90 = 4*n+7*n+9 // - 4*n+7*n+9

-(4*n)-(7*n)-90-9 = 0

-4*n-7*n-90-9 = 0

-11*n-99 = 0 // + 99

-11*n = 99 // : -11

n = 99/(-11)

n = -9

n = -9

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