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w in (-oo:+oo)
6*(-(5*w)-5) = 210 // - 210
6*(-(5*w)-5)-210 = 0
6*(-5*w-5)-210 = 0
6*(-5*w-5)-210 = 0
-30*w-240 = 0
-30*w-240 = 0
-30*w-240 = 0 // + 240
-30*w = 240 // : -30
w = 240/(-30)
w = -8
w = -8
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