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