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w in (-oo:+oo)
(3/4)*(w+8) = (1/3)*(w-7) // - (1/3)*(w-7)
(3/4)*(w+8)-((1/3)*(w-7)) = 0
(3/4)*(w+8)+(-1/3)*(w-7) = 0
3/4*(w+8)-1/3*(w-7) = 0
3/4*(w+8)-1/3*(w-7) = 0
5/12*w+25/3 = 0
5/12*w+25/3 = 0
5/12*w+25/3 = 0 // - 25/3
5/12*w = -25/3 // : 5/12
w = -25/3/5/12
w = -20
w = -20
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