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5*x-(30/7) = 2*x // - 2*x
5*x-(2*x)-(30/7) = 0
5*x-2*x-30/7 = 0
3*x-30/7 = 0 // + 30/7
3*x = 30/7 // : 3
x = 30/7/3
x = 10/7
x = 10/7
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