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4*x-(3/10) = 4 // - 4
4*x-(3/10)-4 = 0
4*x-3/10-4 = 0
4*x-43/10 = 0 // + 43/10
4*x = 43/10 // : 4
x = 43/10/4
x = 43/40
x = 43/40
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