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m in (-oo:+oo)
-(7*m)-(6*m)-3 = 36 // - 36
-(7*m)-(6*m)-36-3 = 0
-7*m-6*m-36-3 = 0
-13*m-39 = 0 // + 39
-13*m = 39 // : -13
m = 39/(-13)
m = -3
m = -3
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