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(1/3)*(18-(6*x)) = 4*(-2*x-6) // - 4*(-2*x-6)
(1/3)*(18-(6*x))-(4*(-2*x-6)) = 0
(1/3)*(18-6*x)-4*(-2*x-6) = 0
1/3*(18-6*x)-4*(-2*x-6) = 0
1/3*(18-6*x)-4*(-2*x-6) = 0
6*x+30 = 0
6*x+30 = 0
6*x+30 = 0 // - 30
6*x = -30 // : 6
x = -30/6
x = -5
x = -5
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