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X-(3/10) = 2*x+5/5 // - 2*x+5/5
X-(2*x)-(3/10)-(5/5) = 0
X-2*x-3/10-1 = 0
X-2*x-13/10 = 0 // - X-13/10
-2*x = -(X-13/10) // : -2
x = (-(X-13/10))/(-2)
x = (13/10-X)/(-2)
x = (13/10-X)/(-2)
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