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Simplifying 400 = -100 * 12 + b Multiply -100 * 12 400 = -1200 + b Solving 400 = -1200 + b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1b' to each side of the equation. 400 + -1b = -1200 + b + -1b Combine like terms: b + -1b = 0 400 + -1b = -1200 + 0 400 + -1b = -1200 Add '-400' to each side of the equation. 400 + -400 + -1b = -1200 + -400 Combine like terms: 400 + -400 = 0 0 + -1b = -1200 + -400 -1b = -1200 + -400 Combine like terms: -1200 + -400 = -1600 -1b = -1600 Divide each side by '-1'. b = 1600 Simplifying b = 1600
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