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X-(2/5) = 10-(x/8) // - 10-(x/8)
X+x/8-(2/5)-10 = 0
X+x/8-2/5-10 = 0
X+1/8*x-52/5 = 0 // - X-52/5
1/8*x = -(X-52/5) // : 1/8
x = (-(X-52/5))/1/8
x = 8*(52/5-X)
x = 8*(52/5-X)
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