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x in (-oo:+oo)
(8/20)*x-8 = (15/20)*x+20 // - (15/20)*x+20
(8/20)*x-((15/20)*x)-20-8 = 0
(8/20)*x+(-3/4)*x-20-8 = 0
-7/20*x-28 = 0 // + 28
-7/20*x = 28 // : -7/20
x = 28/(-7/20)
x = -80
x = -80
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