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(2/5)*(4*x-10) = 6 // - 6
(2/5)*(4*x-10)-6 = 0
2/5*(4*x-10)-6 = 0
2/5*(4*x-10)-6 = 0
8/5*x-10 = 0
8/5*x-10 = 0
8/5*x-10 = 0 // + 10
8/5*x = 10 // : 8/5
x = 10/8/5
x = 25/4
x = 25/4
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