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m in (-oo:+oo)
(3/4)*(m+9) = 15 // - 15
(3/4)*(m+9)-15 = 0
3/4*(m+9)-15 = 0
3/4*(m+9)-15 = 0
3/4*m-33/4 = 0
3/4*m-33/4 = 0
3/4*m-33/4 = 0 // + 33/4
3/4*m = 33/4 // : 3/4
m = 33/4/3/4
m = 11
m = 11
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