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X+(5/7)*x+2/3 = 50/21 // - 50/21
X+(5/7)*x+2/3-(50/21) = 0
X+(5/7)*x+2/3-50/21 = 0
X+5/7*x-12/7 = 0 // - X-12/7
5/7*x = -(X-12/7) // : 5/7
x = (-(X-12/7))/5/7
x = 7/5*(12/7-X)
x = 7/5*(12/7-X)
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