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(1/2)*x-((1/4)*x) = 4 // - 4
(1/2)*x-((1/4)*x)-4 = 0
(1/2)*x+(-1/4)*x-4 = 0
1/4*x-4 = 0 // + 4
1/4*x = 4 // : 1/4
x = 4/1/4
x = 16
x = 16
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