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(1/2)*x-(2*x)+1/2+7/2+6 = 0
(1/2)*x-2*x+1/2+7/2+6 = 0
10-3/2*x = 0 // - 10
-3/2*x = -10 // : -3/2
x = -10/(-3/2)
x = 20/3
x = 20/3
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