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(2/3)*x-((4/5)*x)-9/10 = -17/18 // + -17/18
(2/3)*x-((4/5)*x)-9/10-(-17/18) = 0
(-4/5)*x+(2/3)*x-9/10+17/18 = 0
2/45-2/15*x = 0 // - 2/45
-2/15*x = -2/45 // : -2/15
x = -2/45/(-2/15)
x = 1/3
x = 1/3
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