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(1/2)*x-((1/4)*x)-(19/2)+7 = 0
(1/2)*x+(-1/4)*x-19/2+7 = 0
1/4*x-5/2 = 0 // + 5/2
1/4*x = 5/2 // : 1/4
x = 5/2/1/4
x = 10
x = 10
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