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x in (-oo:+oo)
x/40 = 30/100 // - 30/100
x/40-(30/100) = 0
x/40-3/10 = 0
1/40*x-3/10 = 0 // + 3/10
1/40*x = 3/10 // : 1/40
x = 3/10/1/40
x = 12
x = 12
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