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m in (-oo:+oo)
(1/4)*(4-(3*m))-((4/5)*(3-m))-7 = 0
(1/4)*(4-3*m)+(-4/5)*(3-m)-7 = 0
1/4*(4-3*m)-4/5*(3-m)-7 = 0
1/4*(4-3*m)-4/5*(3-m)-7 = 0
1/20*m-7-7/5 = 0
1/20*m-42/5 = 0
1/20*m-42/5 = 0
1/20*m-42/5 = 0 // + 42/5
1/20*m = 42/5 // : 1/20
m = 42/5/1/20
m = 168
m = 168
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