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-9/2-(1/7) = (-5/2)*x // - (-5/2)*x
-((-5/2)*x)-9/2-(1/7) = 0
(5/2)*x-9/2-1/7 = 0
5/2*x-65/14 = 0 // + 65/14
5/2*x = 65/14 // : 5/2
x = 65/14/5/2
x = 13/7
x = 13/7
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