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w in (-oo:+oo)
7*(-1/4) = -4*(-1/4)*w // + -4*(-1/4)*w
7*(-1/4)-(-4*(-1/4)*w) = 0
7*(-1/4)-w = 0
-w-7/4 = 0 // + 7/4
-w = 7/4 // * -1
w = -7/4
w = -7/4
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