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(2/5)*x-(3/10) = 2 // - 2
(2/5)*x-(3/10)-2 = 0
(2/5)*x-3/10-2 = 0
2/5*x-23/10 = 0 // + 23/10
2/5*x = 23/10 // : 2/5
x = 23/10/2/5
x = 23/4
x = 23/4
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