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x in (-oo:+oo)
(4/5)*x+1/5 = (1/10)*x+1/10 // - (1/10)*x+1/10
(4/5)*x-((1/10)*x)+1/5-(1/10) = 0
(4/5)*x+(-1/10)*x+1/5-1/10 = 0
7/10*x+1/10 = 0 // - 1/10
7/10*x = -1/10 // : 7/10
x = -1/10/7/10
x = -1/7
x = -1/7
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