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140 = (7/15)*x // - (7/15)*x
140-((7/15)*x) = 0
(-7/15)*x+140 = 0
140-7/15*x = 0 // - 140
-7/15*x = -140 // : -7/15
x = -140/(-7/15)
x = 300
x = 300
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