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(2*x)/4-(x/4) = 45/15 // - 45/15
(2*x)/4-(x/4)-(45/15) = 0
(2*x)/4-(x/4)-3 = 0
1/4*x-3 = 0 // + 3
1/4*x = 3 // : 1/4
x = 3/1/4
x = 12
x = 12
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