You have x+4=25 so you minus the four from four and you minus the four from the 25 . and then you get 21 so it is x=21
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x=7 3/4
42?
x/2 = 21 x = 42
x equals 25
x2+4x+4 = 25 x2+4x+4-25 = 0 x2+4x-21 = 0 (x+7)(x-3) = 0 x = -7 or x = 3