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-((5/2)*x)-3/7 = 8/3 // - 8/3
-((5/2)*x)-3/7-(8/3) = 0
(-5/2)*x-3/7-8/3 = 0
-5/2*x-65/21 = 0 // + 65/21
-5/2*x = 65/21 // : -5/2
x = 65/21/(-5/2)
x = -26/21
x = -26/21
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