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x in (-oo:+oo)
x/3 = (x-20)/5+2 // - (x-20)/5+2
x/3-((x-20)/5)-2 = 0
(-1*(x-20))/5+x/3-2 = 0
(-1*3*(x-20))/(3*5)+(5*x)/(3*5)+(-2*3*5)/(3*5) = 0
5*x-1*3*(x-20)-2*3*5 = 0
2*x-30+60 = 0
2*x+30 = 0
(2*x+30)/(3*5) = 0
(2*x+30)/(3*5) = 0 // * 3*5
2*x+30 = 0
2*x+30 = 0 // - 30
2*x = -30 // : 2
x = -30/2
x = -15
x = -15
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