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(4/10)*x-(2*x)+6/5 = 4/5 // - 4/5
(4/10)*x-(2*x)+6/5-(4/5) = 0
(4/10)*x-2*x+6/5-4/5 = 0
2/5-8/5*x = 0 // - 2/5
-8/5*x = -2/5 // : -8/5
x = -2/5/(-8/5)
x = 1/4
x = 1/4
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