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w in (-oo:+oo)
-40/7 = w+(5/7)*w+8 // - w+(5/7)*w+8
-w-((5/7)*w)-40/7-8 = 0
(-5/7)*w-w-40/7-8 = 0
-12/7*w-96/7 = 0 // + 96/7
-12/7*w = 96/7 // : -12/7
w = 96/7/(-12/7)
w = -8
w = -8
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