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w in (-oo:+oo)
1/5-((3/4)*w) = 3*w+77/10 // - 3*w+77/10
1/5-((3/4)*w)-(3*w)-(77/10) = 0
(-3/4)*w-3*w+1/5-77/10 = 0
-15/4*w-15/2 = 0 // + 15/2
-15/4*w = 15/2 // : -15/4
w = 15/2/(-15/4)
w = -2
w = -2
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