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x in (-oo:+oo)
-20 = -x/6 // + -x/6
-(-x/6)-20 = 0
(1/6)*x-20 = 0
1/6*x-20 = 0 // + 20
1/6*x = 20 // : 1/6
x = 20/1/6
x = 120
x = 120
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