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m in (-oo:+oo)
36 = (-3/4)*(5*m+12) // - (-3/4)*(5*m+12)
36-((-3/4)*(5*m+12)) = 0
(3/4)*(5*m+12)+36 = 0
3/4*(5*m+12)+36 = 0
3/4*(5*m+12)+36 = 0
15/4*m+45 = 0
15/4*m+45 = 0
15/4*m+45 = 0 // - 45
15/4*m = -45 // : 15/4
m = -45/15/4
m = -12
m = -12
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