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w in (-oo:+oo)
4*(7*w+10) = 12 // - 12
4*(7*w+10)-12 = 0
4*(7*w+10)-12 = 0
28*w+28 = 0
28*w+28 = 0
28*w+28 = 0 // - 28
28*w = -28 // : 28
w = -28/28
w = -1
w = -1
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