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3/11 = (4/10)*x // - (4/10)*x
3/11-((4/10)*x) = 0
(-2/5)*x+3/11 = 0
3/11-2/5*x = 0 // - 3/11
-2/5*x = -3/11 // : -2/5
x = -3/11/(-2/5)
x = 15/22
x = 15/22
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