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m in (-oo:+oo)
4-6*m = 6*m+148 // - 6*m+148
4-6*m-(6*m)-148 = 0
4-6*m-6*m-148 = 0
-12*m-144 = 0 // + 144
-12*m = 144 // : -12
m = 144/(-12)
m = -12
m = -12
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