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w in (-oo:+oo)
w/3+1 = -2.75 // + 2.75
w/3+1+2.75 = 0
1/3*w+3.75 = 0 // - 3.75
1/3*w = -3.75 // : 1/3
w = -3.75/1/3
w = -11.25000011
w = -11.25000011
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