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x in (-oo:+oo)
x/20-(1/5) = 10 // - 10
x/20-(1/5)-10 = 0
x/20-1/5-10 = 0
1/20*x-51/5 = 0 // + 51/5
1/20*x = 51/5 // : 1/20
x = 51/5/1/20
x = 204
x = 204
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