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w in (-oo:+oo)
2*(3-(7*w)) = 6 // - 6
2*(3-(7*w))-6 = 0
2*(3-7*w)-6 = 0
2*(3-7*w)-6 = 0
-14*w = 0
-14*w = 0
-14*w = 0 // : -14
w = 0
w = 0
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