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(1/2)*x-(2*x)-10 = -53/2 // + -53/2
(1/2)*x-(2*x)-(-53/2)-10 = 0
(1/2)*x-2*x+53/2-10 = 0
33/2-3/2*x = 0 // - 33/2
-3/2*x = -33/2 // : -3/2
x = -33/2/(-3/2)
x = 11
x = 11
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