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6*x-((4/5)*(15*x-50)) = 0
(-4/5)*(15*x-50)+6*x = 0
6*x-4/5*(15*x-50) = 0
6*x-4/5*(15*x-50) = 0
40-6*x = 0
40-6*x = 0
40-6*x = 0 // - 40
-6*x = -40 // : -6
x = -40/(-6)
x = 20/3
x = 20/3
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