1-2w=-7

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Solution for 1-2w=-7 equation: 


w in (-oo:+oo)

1-(2*w) = -7 // + 7

1-(2*w)+7 = 0

1-2*w+7 = 0

8-2*w = 0 // - 8

-2*w = -8 // : -2

w = -8/(-2)

w = 4

w = 4

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