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w in (-oo:+oo)
(1/4)*(w+4)+(1/2)*w = 10 // - 10
(1/4)*(w+4)+(1/2)*w-10 = 0
1/4*(w+4)+w/2-10 = 0
(1/4*2*(w+4))/2+w/2+(-10*2)/2 = 0
1/4*2*(w+4)+w-10*2 = 0
3/2*w-20+2 = 0
3/2*w-18 = 0
(3/2*w-18)/2 = 0
(3/2*w-18)/2 = 0 // * 2
3/2*w-18 = 0
3/2*w-18 = 0 // + 18
3/2*w = 18 // : 3/2
w = 18/3/2
w = 12
w = 12
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