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w in (-oo:+oo)
2*(10-(7*w)) = -148 // + 148
2*(10-(7*w))+148 = 0
2*(10-7*w)+148 = 0
2*(10-7*w)+148 = 0
168-14*w = 0
168-14*w = 0
168-14*w = 0 // - 168
-14*w = -168 // : -14
w = -168/(-14)
w = 12
w = 12
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