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m in (-oo:+oo)
3*(5*m+7) = -114 // + 114
3*(5*m+7)+114 = 0
3*(5*m+7)+114 = 0
15*m+135 = 0
15*m+135 = 0
15*m+135 = 0 // - 135
15*m = -135 // : 15
m = -135/15
m = -9
m = -9
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