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(3/5)*x = 7*(1-x) // - 7*(1-x)
(3/5)*x-(7*(1-x)) = 0
(3/5)*x-7*(1-x) = 0
(3*x)/5-7*(1-x) = 0
(-7*5*(1-x))/5+(3*x)/5 = 0
3*x-7*5*(1-x) = 0
38*x-35 = 0
(38*x-35)/5 = 0
(38*x-35)/5 = 0 // * 5
38*x-35 = 0
38*x-35 = 0 // + 35
38*x = 35 // : 38
x = 35/38
x = 35/38
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