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3/5-(6*x) = (-5/7)*x-(1644/35) // - (-5/7)*x-(1644/35)
3/5-(6*x)-((-5/7)*x)+1644/35 = 0
(5/7)*x-6*x+3/5+1644/35 = 0
333/7-37/7*x = 0 // - 333/7
-37/7*x = -333/7 // : -37/7
x = -333/7/(-37/7)
x = 9
x = 9
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