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x in (-oo:+oo)
(3/7)*w-11 = (-4/7)*x // - (-4/7)*x
(3/7)*w-((-4/7)*x)-11 = 0
(3/7)*w+(4/7)*x-11 = 0
3/7*w+4/7*x-11 = 0 // - 3/7*w-11
4/7*x = -(3/7*w-11) // : 4/7
x = (-(3/7*w-11))/4/7
x = 7/4*(11-(3/7*w))
x = 7/4*(11-(3/7*w))
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