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(1/2)*x+x/4+x/6 = x-25 // - x-25
(1/2)*x+x/4+x/6-x+25 = 0
25-1/12*x = 0 // - 25
-1/12*x = -25 // : -1/12
x = -25/(-1/12)
x = 300
x = 300
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