2b+7=4b+21

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Solution for 2b+7=4b+21 equation: 


b in (-oo:+oo)

2*b+7 = 4*b+21 // - 4*b+21

2*b-(4*b)-21+7 = 0

2*b-4*b-21+7 = 0

-2*b-14 = 0 // + 14

-2*b = 14 // : -2

b = 14/(-2)

b = -7

b = -7

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