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x in (-oo:+oo)
(5/12)*x = 10*y+20 // - 10*y+20
(5/12)*x-(10*y)-20 = 0
(5/12)*x-10*y-20 = 0
5/12*x-10*y-20 = 0 // + -10*y-20
5/12*x = -(-10*y-20) // : 5/12
x = (-(-10*y-20))/5/12
x = 12/5*(20-(-10*y))
x = 12/5*(20-(-10*y))
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