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w in (-oo:+oo)
(-4/5)*w+4/7 = 33/70 // - 33/70
(-4/5)*w+4/7-(33/70) = 0
(-4/5)*w+4/7-33/70 = 0
1/10-4/5*w = 0 // - 1/10
-4/5*w = -1/10 // : -4/5
w = -1/10/(-4/5)
w = 1/8
w = 1/8
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