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m in (-oo:+oo)
6*(m+7) = -18 // + 18
6*(m+7)+18 = 0
6*(m+7)+18 = 0
6*m+60 = 0
6*m+60 = 0
6*m+60 = 0 // - 60
6*m = -60 // : 6
m = -60/6
m = -10
m = -10
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