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w in (-oo:+oo)
w/3.5+1.4 = 5.6 // - 5.6
w/3.5-5.6+1.4 = 0
0.28571429*w-4.2 = 0 // + 4.2
0.28571429*w = 4.2 // : 0.28571429
w = 4.2/0.28571429
w = 14.69999978
w = 14.69999978
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