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(-1/2)*x-6 = 65/2-6*x // - 65/2-6*x
(-1/2)*x-(-6*x)-(65/2)-6 = 0
(-1/2)*x+6*x-65/2-6 = 0
11/2*x-77/2 = 0 // + 77/2
11/2*x = 77/2 // : 11/2
x = 77/2/11/2
x = 7
x = 7
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