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(-1/3)*x-1 = (-2/3)*x-6 // - (-2/3)*x-6
(-1/3)*x-((-2/3)*x)-1+6 = 0
(-1/3)*x+(2/3)*x-1+6 = 0
1/3*x+5 = 0 // - 5
1/3*x = -5 // : 1/3
x = -5/1/3
x = -15
x = -15
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