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x in (-oo:+oo)
-8 = -x/3-20 // + -x/3-20
20-(-x/3)-8 = 0
(1/3)*x-8+20 = 0
1/3*x+12 = 0 // - 12
1/3*x = -12 // : 1/3
x = -12/1/3
x = -36
x = -36
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