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x in (-oo:+oo)
3*(5-(x/3)) = x-20 // - x-20
3*(5-(x/3))-x+20 = 0
3*(5-1/3*x)-x+20 = 0
3*(5-1/3*x)-x+20 = 0
15-2*x+20 = 0
35-2*x = 0
35-2*x = 0
35-2*x = 0 // - 35
-2*x = -35 // : -2
x = -35/(-2)
x = 35/2
x = 35/2
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