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w in (-oo:+oo)
(1/2)*w-7 = -37/5 // + -37/5
(1/2)*w-(-37/5)-7 = 0
(1/2)*w+37/5-7 = 0
1/2*w+2/5 = 0 // - 2/5
1/2*w = -2/5 // : 1/2
w = -2/5/1/2
w = -4/5
w = -4/5
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