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w in (-oo:+oo)
4*(9-7*w) = 148 // - 148
4*(9-7*w)-148 = 0
4*(9-7*w)-148 = 0
-28*w-112 = 0
-28*w-112 = 0
-28*w-112 = 0 // + 112
-28*w = 112 // : -28
w = 112/(-28)
w = -4
w = -4
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