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m in (-oo:+oo)
(9/10)*m-28 = (7/10)*m+12 // - (7/10)*m+12
(9/10)*m-((7/10)*m)-28-12 = 0
(9/10)*m+(-7/10)*m-28-12 = 0
1/5*m-40 = 0 // + 40
1/5*m = 40 // : 1/5
m = 40/1/5
m = 200
m = 200
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