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m in (-oo:+oo)
(2*m)/5+4 = (-10*m)/9-3 // - (-10*m)/9-3
(2*m)/5-((-10*m)/9)+3+4 = 0
(2*m)/5+(10/9)*m+3+4 = 0
68/45*m+7 = 0 // - 7
68/45*m = -7 // : 68/45
m = -7/68/45
m = -315/68
m = -315/68
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