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m in (-oo:+oo)
((2*5)/7)*m-(9/10) = (4/5)*m // - (4/5)*m
((2*5)/7)*m-((4/5)*m)-(9/10) = 0
((2*5)/7)*m+(-4/5)*m-9/10 = 0
22/35*m-9/10 = 0 // + 9/10
22/35*m = 9/10 // : 22/35
m = 9/10/22/35
m = 63/44
m = 63/44
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