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10*(13/5) = 10*((9*x)/10) // - 10*((9*x)/10)
10*(13/5)-(10*((9*x)/10)) = 0
10*(13/5)-9*x = 0
26-9*x = 0 // - 26
-9*x = -26 // : -9
x = -26/(-9)
x = 26/9
x = 26/9
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