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w in (-oo:+oo)
4*(2-w) = 36 // - 36
4*(2-w)-36 = 0
4*(2-w)-36 = 0
-4*w-28 = 0
-4*w-28 = 0
-4*w-28 = 0 // + 28
-4*w = 28 // : -4
w = 28/(-4)
w = -7
w = -7
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