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w in (-oo:+oo)
4*w+8 = -3*w-48 // + -3*w-48
4*w-(-3*w)+8+48 = 0
4*w+3*w+8+48 = 0
7*w+56 = 0 // - 56
7*w = -56 // : 7
w = -56/7
w = -8
w = -8
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