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x in (-oo:+oo)
x-8 = (3*x+20)/7 // - (3*x+20)/7
x-((3*x+20)/7)-8 = 0
(-1*(3*x+20))/7+x-8 = 0
(-1*(3*x+20))/7+(7*x)/7+(-8*7)/7 = 0
7*x-1*(3*x+20)-8*7 = 0
4*x-56-20 = 0
4*x-76 = 0
(4*x-76)/7 = 0
(4*x-76)/7 = 0 // * 7
4*x-76 = 0
4*x-76 = 0 // + 76
4*x = 76 // : 4
x = 76/4
x = 19
x = 19
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