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X/2+x/5+x = 17/2 // - 17/2
X/2+x/5+x-(17/2) = 0
X/2+x/5+x-17/2 = 0
1/2*X+6/5*x-17/2 = 0 // - 1/2*X-17/2
6/5*x = -(1/2*X-17/2) // : 6/5
x = (-(1/2*X-17/2))/6/5
x = 5/6*(17/2-(1/2*X))
x = 5/6*(17/2-(1/2*X))
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