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w in (-oo:+oo)
-13.1 = w/3+6.1 // - w/3+6.1
-(w/3)-13.1-6.1 = 0
-1/3*w-19.2 = 0 // + 19.2
-1/3*w = 19.2 // : -1/3
w = 19.2/(-1/3)
w = -57.60000058
w = -57.60000058
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