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