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m in (-oo:+oo)
(3/4)*(6*m+12) = 30 // - 30
(3/4)*(6*m+12)-30 = 0
3/4*(6*m+12)-30 = 0
3/4*(6*m+12)-30 = 0
9/2*m-21 = 0
9/2*m-21 = 0
9/2*m-21 = 0 // + 21
9/2*m = 21 // : 9/2
m = 21/9/2
m = 14/3
m = 14/3
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