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5*x-x+2/3 = (1/2)*x // - (1/2)*x
5*x-x-((1/2)*x)+2/3 = 0
5*x-x+(-1/2)*x+2/3 = 0
7/2*x+2/3 = 0 // - 2/3
7/2*x = -2/3 // : 7/2
x = -2/3/7/2
x = -4/21
x = -4/21
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