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x in (-oo:+oo)
x/20 = 100/10 // - 100/10
x/20-(100/10) = 0
x/20-10 = 0
1/20*x-10 = 0 // + 10
1/20*x = 10 // : 1/20
x = 10/1/20
x = 200
x = 200
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