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w in (-oo:+oo)
(1/2)*(w+4)+(1/2)*w = 10 // - 10
(1/2)*(w+4)+(1/2)*w-10 = 0
1/2*(w+4)+w/2-10 = 0
(1/2*2*(w+4))/2+w/2+(-10*2)/2 = 0
1/2*2*(w+4)+w-10*2 = 0
2*w-20+4 = 0
2*w-16 = 0
(2*w-16)/2 = 0
(2*w-16)/2 = 0 // * 2
2*w-16 = 0
2*w-16 = 0 // + 16
2*w = 16 // : 2
w = 16/2
w = 8
w = 8
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