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x in (-oo:+oo)
((6*x)/4)*y+4+30 = 129 // - 129
((6*x)/4)*y-129+4+30 = 0
3/2*x*y-95 = 0 // + 95
3/2*x*y = 95 // : 3/2*y
x = 95/(3/2*y)
x = 190/3*y^-1
x = 190/3*y^-1
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