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m in (-oo:+oo)
4*m+7 = 77-6*m // - 77-6*m
4*m-(-6*m)-77+7 = 0
4*m+6*m-77+7 = 0
10*m-70 = 0 // + 70
10*m = 70 // : 10
m = 70/10
m = 7
m = 7
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