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(3*x)/5-0.5 = 1.9 // - 1.9
(3*x)/5-1.9-0.5 = 0
3/5*x-2.4 = 0 // + 2.4
3/5*x = 2.4 // : 3/5
x = 2.4/3/5
x = 4
x = 4
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