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m in (-oo:+oo)
(1/4)*(4-(2*m))-((4/5)*(3-m))+7 = 0
(1/4)*(4-2*m)+(-4/5)*(3-m)+7 = 0
1/4*(4-2*m)-4/5*(3-m)+7 = 0
1/4*(4-2*m)-4/5*(3-m)+7 = 0
3/10*m-7/5+7 = 0
3/10*m+28/5 = 0
3/10*m+28/5 = 0
3/10*m+28/5 = 0 // - 28/5
3/10*m = -28/5 // : 3/10
m = -28/5/3/10
m = -56/3
m = -56/3
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