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x in (-oo:+oo)
x/20 = 3/2 // - 3/2
x/20-(3/2) = 0
x/20-3/2 = 0
1/20*x-3/2 = 0 // + 3/2
1/20*x = 3/2 // : 1/20
x = 3/2/1/20
x = 30
x = 30
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