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(5/7)*x+(1/2)*x = 2/5-(2*x) // - 2/5-(2*x)
(5/7)*x+(1/2)*x+2*x-(2/5) = 0
(5/7)*x+(1/2)*x+2*x-2/5 = 0
45/14*x-2/5 = 0 // + 2/5
45/14*x = 2/5 // : 45/14
x = 2/5/45/14
x = 28/225
x = 28/225
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