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w in (-oo:+oo)
-7*w-((2/5)*w)-(7/10) = 807/10 // - 807/10
-7*w-((2/5)*w)-(7/10)-(807/10) = 0
(-2/5)*w-7*w-7/10-807/10 = 0
-37/5*w-407/5 = 0 // + 407/5
-37/5*w = 407/5 // : -37/5
w = 407/5/(-37/5)
w = -11
w = -11
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