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x in (-oo:+oo)
x/50 = 30/100 // - 30/100
x/50-(30/100) = 0
x/50-3/10 = 0
1/50*x-3/10 = 0 // + 3/10
1/50*x = 3/10 // : 1/50
x = 3/10/1/50
x = 15
x = 15
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