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(-1/3)*x+9/10 = x-17/30 // - x-17/30
(-1/3)*x-x+9/10-(-17/30) = 0
(-1/3)*x-x+9/10+17/30 = 0
22/15-4/3*x = 0 // - 22/15
-4/3*x = -22/15 // : -4/3
x = -22/15/(-4/3)
x = 11/10
x = 11/10
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