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w in (-oo:+oo)
3*w-3/5 = -168/5 // + -168/5
3*w-3/5-(-168/5) = 0
3*w-3/5+168/5 = 0
3*w+33 = 0 // - 33
3*w = -33 // : 3
w = -33/3
w = -11
w = -11
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