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(1/2)*x-10 = 2*x-(17/2) // - 2*x-(17/2)
(1/2)*x-(2*x)+17/2-10 = 0
(1/2)*x-2*x+17/2-10 = 0
-3/2*x-3/2 = 0 // + 3/2
-3/2*x = 3/2 // : -3/2
x = 3/2/(-3/2)
x = -1
x = -1
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