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