-n+7=-3n+15

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Solution for -n+7=-3n+15 equation: 


n in (-oo:+oo)

7-n = 15-3*n // - 15-3*n

7-n-(-3*n)-15 = 0

3*n-n-15+7 = 0

2*n-8 = 0 // + 8

2*n = 8 // : 2

n = 8/2

n = 4

n = 4

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