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x in (-oo:+oo)
x/30 = 15/20 // - 15/20
x/30-(15/20) = 0
x/30-3/4 = 0
1/30*x-3/4 = 0 // + 3/4
1/30*x = 3/4 // : 1/30
x = 3/4/1/30
x = 45/2
x = 45/2
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