4w+9=21

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Solution for 4w+9=21 equation: 


w in (-oo:+oo)

4*w+9 = 21 // - 21

4*w-21+9 = 0

4*w-12 = 0 // + 12

4*w = 12 // : 4

w = 12/4

w = 3

w = 3

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