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x in (-oo:+oo)
x/100 = 30/45 // - 30/45
x/100-(30/45) = 0
x/100-2/3 = 0
1/100*x-2/3 = 0 // + 2/3
1/100*x = 2/3 // : 1/100
x = 2/3/1/100
x = 200/3
x = 200/3
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