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w in (-oo:+oo)
(-2/5)*w+6*w+2/7 = -1558/35 // + -1558/35
(-2/5)*w+6*w+2/7-(-1558/35) = 0
(-2/5)*w+6*w+2/7+1558/35 = 0
28/5*w+224/5 = 0 // - 224/5
28/5*w = -224/5 // : 28/5
w = -224/5/28/5
w = -8
w = -8
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