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9/10-4*x = -((1/3)*x)-17/30 // + -((1/3)*x)-17/30
(1/3)*x-4*x+9/10-(-17/30) = 0
(1/3)*x-4*x+9/10+17/30 = 0
22/15-11/3*x = 0 // - 22/15
-11/3*x = -22/15 // : -11/3
x = -22/15/(-11/3)
x = 2/5
x = 2/5
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