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