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4*x+2*x-(5/3) = 2*x-7 // - 2*x-7
4*x+2*x-(2*x)-(5/3)+7 = 0
4*x+2*x-2*x-5/3+7 = 0
4*x+16/3 = 0 // - 16/3
4*x = -16/3 // : 4
x = -16/3/4
x = -4/3
x = -4/3
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