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(1/2)*x-(5*x)+1 = 65/2 // - 65/2
(1/2)*x-(5*x)-(65/2)+1 = 0
(1/2)*x-5*x-65/2+1 = 0
-9/2*x-63/2 = 0 // + 63/2
-9/2*x = 63/2 // : -9/2
x = 63/2/(-9/2)
x = -7
x = -7
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