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w in (-oo:+oo)
4*(5-(7*w)) = -148 // + 148
4*(5-(7*w))+148 = 0
4*(5-7*w)+148 = 0
4*(5-7*w)+148 = 0
168-28*w = 0
168-28*w = 0
168-28*w = 0 // - 168
-28*w = -168 // : -28
w = -168/(-28)
w = 6
w = 6
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