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(2/5)*(5*x-10) = 19 // - 19
(2/5)*(5*x-10)-19 = 0
2/5*(5*x-10)-19 = 0
2/5*(5*x-10)-19 = 0
2*x-23 = 0
2*x-23 = 0
2*x-23 = 0 // + 23
2*x = 23 // : 2
x = 23/2
x = 23/2
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