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x in (-oo:+oo)
x-20 = (20*x)/3 // - (20*x)/3
x-((20*x)/3)-20 = 0
x+(-20/3)*x-20 = 0
-17/3*x-20 = 0 // + 20
-17/3*x = 20 // : -17/3
x = 20/(-17/3)
x = -60/17
x = -60/17
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