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x in (-oo:+oo)
(1/3)*(6*x+18) = -24 // + 24
(1/3)*(6*x+18)+24 = 0
1/3*(6*x+18)+24 = 0
1/3*(6*x+18)+24 = 0
2*x+30 = 0
2*x+30 = 0
2*x+30 = 0 // - 30
2*x = -30 // : 2
x = -30/2
x = -15
x = -15
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