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m in (-oo:+oo)
3*(7-4*m) = -99 // + 99
3*(7-4*m)+99 = 0
3*(7-4*m)+99 = 0
120-12*m = 0
120-12*m = 0
120-12*m = 0 // - 120
-12*m = -120 // : -12
m = -120/(-12)
m = 10
m = 10
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