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w in (-oo:+oo)
(1/3)*(w+2) = 5 // - 5
(1/3)*(w+2)-5 = 0
1/3*(w+2)-5 = 0
1/3*(w+2)-5 = 0
1/3*w-13/3 = 0
1/3*w-13/3 = 0
1/3*w-13/3 = 0 // + 13/3
1/3*w = 13/3 // : 1/3
w = 13/3/1/3
w = 13
w = 13
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