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x in (-oo:+oo)
((6*d)/7)*x = w/y // - w/y
((6*d)/7)*x-(w/y) = 0
6/7*d*x-(w*y^-1) = 0 // + w*y^-1
6/7*d*x = w*y^-1 // : 6/7*d
x = (w*y^-1)/(6/7*d)
x = 7/6*d^-1*w*y^-1
x = 7/6*d^-1*w*y^-1
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