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(4/5)*x-(2*x)-3/10 = 2/5 // - 2/5
(4/5)*x-(2*x)-3/10-(2/5) = 0
(4/5)*x-2*x-3/10-2/5 = 0
-6/5*x-7/10 = 0 // + 7/10
-6/5*x = 7/10 // : -6/5
x = 7/10/(-6/5)
x = -7/12
x = -7/12
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