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x in (-oo:+oo)
10^-2 = (20*x)/5 // - (20*x)/5
10^-2-((20*x)/5) = 0
10^-2-4*x = 0
1/100-4*x = 0 // - 1/100
-4*x = -1/100 // : -4
x = -1/100/(-4)
x = 1/400
x = 1/400
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