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3-((1/2)*x) = 5*x // - 5*x
3-((1/2)*x)-(5*x) = 0
(-1/2)*x-5*x+3 = 0
3-11/2*x = 0 // - 3
-11/2*x = -3 // : -11/2
x = -3/(-11/2)
x = 6/11
x = 6/11
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