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x in (-oo:+oo)
x/20 = 900/30 // - 900/30
x/20-(900/30) = 0
x/20-30 = 0
1/20*x-30 = 0 // + 30
1/20*x = 30 // : 1/20
x = 30/1/20
x = 600
x = 600
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