7+2b=21

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Solution for 7+2b=21 equation: 


b in (-oo:+oo)

2*b+7 = 21 // - 21

2*b-21+7 = 0

2*b-14 = 0 // + 14

2*b = 14 // : 2

b = 14/2

b = 7

b = 7

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