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w in (-oo:+oo)
-142/3 = 7*w-(3*w)+2/3 // - 7*w-(3*w)+2/3
3*w-(7*w)-142/3-(2/3) = 0
3*w-7*w-142/3-2/3 = 0
-4*w-48 = 0 // + 48
-4*w = 48 // : -4
w = 48/(-4)
w = -12
w = -12
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