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4*x-(5/3) = 90 // - 90
4*x-(5/3)-90 = 0
4*x-5/3-90 = 0
4*x-275/3 = 0 // + 275/3
4*x = 275/3 // : 4
x = 275/3/4
x = 275/12
x = 275/12
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