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w in (-oo:+oo)
w/6+2.1 = -7.5 // + 7.5
w/6+2.1+7.5 = 0
1/6*w+9.6 = 0 // - 9.6
1/6*w = -9.6 // : 1/6
w = -9.6/1/6
w = -57.59999885
w = -57.59999885
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