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15-((1/9)*x) = (-1/6)*x // - (-1/6)*x
15-((1/9)*x)-((-1/6)*x) = 0
(-1/9)*x+(1/6)*x+15 = 0
1/18*x+15 = 0 // - 15
1/18*x = -15 // : 1/18
x = -15/1/18
x = -270
x = -270
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