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x in (-oo:+oo)
x/9 = y/b // - y/b
x/9-(y/b) = 0
1/9*x-(b^-1*y) = 0 // + b^-1*y
1/9*x = b^-1*y // : 1/9
x = (b^-1*y)/1/9
x = 9*b^-1*y
x = 9*b^-1*y
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