-7+2b=-21

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


b in (-oo:+oo)

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

2*b-7+21 = 0

2*b+14 = 0 // - 14

2*b = -14 // : 2

b = -14/2

b = -7

b = -7

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