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w in (-oo:+oo)
-9*(-1/9)*w = 36*(-1/9) // - 36*(-1/9)
-9*(-1/9)*w-(36*(-1/9)) = 0
4-9*(-1/9)*w = 0
w+4 = 0 // - 4
w = -4
w = -4
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