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m in (-oo:+oo)
2*(7-(6*m)) = -130 // + 130
2*(7-(6*m))+130 = 0
2*(7-6*m)+130 = 0
2*(7-6*m)+130 = 0
144-12*m = 0
144-12*m = 0
144-12*m = 0 // - 144
-12*m = -144 // : -12
m = -144/(-12)
m = 12
m = 12
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