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x in (-oo:+oo)
(1/10)*x = (2/10)*(x+2) // - (2/10)*(x+2)
(1/10)*x-((2/10)*(x+2)) = 0
(-1/5)*(x+2)+(1/10)*x = 0
x/10-1/5*(x+2) = 0
(-1/5*10*(x+2))/10+x/10 = 0
x-1/5*10*(x+2) = 0
-x-4 = 0
(-x-4)/10 = 0
(-x-4)/10 = 0 // * 10
-x-4 = 0
-x-4 = 0 // + 4
-x = 4 // * -1
x = -4
x = -4
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