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w in (-oo:+oo)
4*w+3/4 = -61/4 // + -61/4
4*w+3/4-(-61/4) = 0
4*w+3/4+61/4 = 0
4*w+16 = 0 // - 16
4*w = -16 // : 4
w = -16/4
w = -4
w = -4
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