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300 = (500/133)*x // - (500/133)*x
300-((500/133)*x) = 0
(-500/133)*x+300 = 0
300-500/133*x = 0 // - 300
-500/133*x = -300 // : -500/133
x = -300/(-500/133)
x = 399/5
x = 399/5
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