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200 = (4/7)*x // - (4/7)*x
200-((4/7)*x) = 0
(-4/7)*x+200 = 0
200-4/7*x = 0 // - 200
-4/7*x = -200 // : -4/7
x = -200/(-4/7)
x = 350
x = 350
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