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10*(13-((7/5)*x)) = 0
10*((-7/5)*x+13) = 0
10*(13-7/5*x) = 0
13-7/5*x = 0 // - 13
-7/5*x = -13 // : -7/5
x = -13/(-7/5)
x = 65/7
x = 65/7
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