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(3*x)/12 = 5/10 // - 5/10
(3*x)/12-(5/10) = 0
(3*x)/12-1/2 = 0
1/4*x-1/2 = 0 // + 1/2
1/4*x = 1/2 // : 1/4
x = 1/2/1/4
x = 2
x = 2
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