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(3/10)*x-(3/11) = (7/10)*x-(9/11) // - (7/10)*x-(9/11)
(3/10)*x-((7/10)*x)-(3/11)+9/11 = 0
(3/10)*x+(-7/10)*x-3/11+9/11 = 0
6/11-2/5*x = 0 // - 6/11
-2/5*x = -6/11 // : -2/5
x = -6/11/(-2/5)
x = 15/11
x = 15/11
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