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x in (-oo:+oo)
x-90 = (x-180)/5-10 // - (x-180)/5-10
x-((x-180)/5)-90+10 = 0
(-1*(x-180))/5+x-90+10 = 0
(-1*(x-180))/5+(5*x)/5+(-90*5)/5+(5*10)/5 = 0
5*x-1*(x-180)-90*5+5*10 = 0
4*x-450+50+180 = 0
4*x-270+50 = 0
4*x-220 = 0
(4*x-220)/5 = 0
(4*x-220)/5 = 0 // * 5
4*x-220 = 0
4*x-220 = 0 // + 220
4*x = 220 // : 4
x = 220/4
x = 55
x = 55
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