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(1/6)*x-1 = (-4/5)*x-13 // - (-4/5)*x-13
(1/6)*x-((-4/5)*x)-1+13 = 0
(1/6)*x+(4/5)*x-1+13 = 0
29/30*x+12 = 0 // - 12
29/30*x = -12 // : 29/30
x = -12/29/30
x = -360/29
x = -360/29
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