0
-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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∙ 14y ago
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