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x in (-oo:+oo)
x-20 = (5*x)/3 // - (5*x)/3
x-((5*x)/3)-20 = 0
x+(-5/3)*x-20 = 0
-2/3*x-20 = 0 // + 20
-2/3*x = 20 // : -2/3
x = 20/(-2/3)
x = -30
x = -30
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