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