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3/5 = (7/10)*x // - (7/10)*x
3/5-((7/10)*x) = 0
(-7/10)*x+3/5 = 0
3/5-7/10*x = 0 // - 3/5
-7/10*x = -3/5 // : -7/10
x = -3/5/(-7/10)
x = 6/7
x = 6/7
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