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x in (-oo:+oo)
(15*x)/900 = 20*y // - 20*y
(15*x)/900-(20*y) = 0
(15*x)/900-20*y = 0
1/60*x-20*y = 0 // + -20*y
1/60*x = -(-20*y) // : 1/60
x = (-(-20*y))/1/60
x = 1200*y
x = 1200*y
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