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w in (-oo:+oo)
(-9/2)*w = (3/8)*(7-(4*w)) // - (3/8)*(7-(4*w))
(-9/2)*w-((3/8)*(7-(4*w))) = 0
(-3/8)*(7-4*w)+(-9/2)*w = 0
(-9*w)/2-3/8*(7-4*w) = 0
(-3/8*2*(7-4*w))/2+(-9*w)/2 = 0
-3/8*2*(7-4*w)-9*w = 0
-6*w-21/4 = 0
(-6*w-21/4)/2 = 0
(-6*w-21/4)/2 = 0 // * 2
-6*w-21/4 = 0
-6*w-21/4 = 0 // + 21/4
-6*w = 21/4 // : -6
w = 21/4/(-6)
w = -7/8
w = -7/8
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