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x in (-oo:+oo)
(x/4)*y = 19 // - 19
(x/4)*y-19 = 0
1/4*x*y-19 = 0 // + 19
1/4*x*y = 19 // : 1/4*y
x = 19/(1/4*y)
x = 76*y^-1
x = 76*y^-1
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