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x in (-oo:+oo)
(-6/5)*(x+10)+(1/5)*x = -6 // + 6
(-6/5)*(x+10)+(1/5)*x+6 = 0
x/5-6/5*(x+10)+6 = 0
(-6/5*5*(x+10))/5+x/5+(5*6)/5 = 0
x-6/5*5*(x+10)+5*6 = 0
30-5*x-60 = 0
-5*x-30 = 0
(-5*x-30)/5 = 0
(-5*x-30)/5 = 0 // * 5
-5*x-30 = 0
-5*x-30 = 0 // + 30
-5*x = 30 // : -5
x = 30/(-5)
x = -6
x = -6
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