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x in (-oo:+oo)
(1/2)*x-1 = (1/5)*x-2 // - (1/5)*x-2
(1/2)*x-((1/5)*x)-1+2 = 0
(1/2)*x+(-1/5)*x-1+2 = 0
3/10*x+1 = 0 // - 1
3/10*x = -1 // : 3/10
x = -1/3/10
x = -10/3
x = -10/3
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