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-b = 12.5 : multiply both sides by -1

-b x -1 = 12.5 x -1

b = -12.5

Alternatively,

-b = 12.5 : add b to both sides

-b + b = 12.5 + b

0 = 12.5 + b : subtract 12.5 from both sides

-12.5 = 12.5 + b - 12.5

-12.5 = b

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15y ago

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