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x in (-oo:+oo)
(1/5)*(x-4) = 3*x-(2*(x-1))+66/5 // - 3*x-(2*(x-1))+66/5
(1/5)*(x-4)+2*(x-1)-(3*x)-(66/5) = 0
(1/5)*(x-4)+2*(x-1)-3*x-66/5 = 0
1/5*(x-4)+2*(x-1)-3*x-66/5 = 0
(1/5*5*(x-4))/5+(2*5*(x-1))/5+(-3*5*x)/5-66/5 = 0
1/5*5*(x-4)+2*5*(x-1)-3*5*x-66 = 0
11*x-15*x-66-14 = 0
-4*x-66-14 = 0
-4*x-80 = 0
(-4*x-80)/5 = 0
(-4*x-80)/5 = 0 // * 5
-4*x-80 = 0
-4*x-80 = 0 // + 80
-4*x = 80 // : -4
x = 80/(-4)
x = -20
x = -20
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