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(3/5)*x-(1/2) = 19.5 // - 19.5
(3/5)*x-(1/2)-19.5 = 0
(3/5)*x-1/2-19.5 = 0
3/5*x-20 = 0 // + 20
3/5*x = 20 // : 3/5
x = 20/3/5
x = 100/3
x = 100/3
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