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w in (-oo:+oo)
(-3/4)*w-((1/2)*w)-4 = 12 // - 12
(-3/4)*w-((1/2)*w)-12-4 = 0
(-3/4)*w+(-1/2)*w-12-4 = 0
-5/4*w-16 = 0 // + 16
-5/4*w = 16 // : -5/4
w = 16/(-5/4)
w = -64/5
w = -64/5
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