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(1/2)*(5-x) = 1/4 // - 1/4
(1/2)*(5-x)-(1/4) = 0
(1/2)*(5-x)-1/4 = 0
1/2*(5-x)-1/4 = 0
(1/2*4*(5-x))/4-1/4 = 0
1/2*4*(5-x)-1 = 0
9-2*x = 0
(9-2*x)/4 = 0
(9-2*x)/4 = 0 // * 4
9-2*x = 0
9-2*x = 0 // - 9
-2*x = -9 // : -2
x = -9/(-2)
x = 9/2
x = 9/2
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