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x in (-oo:+oo)
(-6/5)*(x+20)+(1/5)*x = -7 // + 7
(-6/5)*(x+20)+(1/5)*x+7 = 0
x/5-6/5*(x+20)+7 = 0
(-6/5*5*(x+20))/5+x/5+(5*7)/5 = 0
x-6/5*5*(x+20)+5*7 = 0
35-5*x-120 = 0
-5*x-85 = 0
(-5*x-85)/5 = 0
(-5*x-85)/5 = 0 // * 5
-5*x-85 = 0
-5*x-85 = 0 // + 85
-5*x = 85 // : -5
x = 85/(-5)
x = -17
x = -17
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