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3/20 = (7*x)/40 // - (7*x)/40
3/20-((7*x)/40) = 0
(-7/40)*x+3/20 = 0
3/20-7/40*x = 0 // - 3/20
-7/40*x = -3/20 // : -7/40
x = -3/20/(-7/40)
x = 6/7
x = 6/7
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