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Simplifying 9 = -3(4) + b Multiply -3 * 4 9 = -12 + b Solving 9 = -12 + 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. 9 + -1b = -12 + b + -1b Combine like terms: b + -1b = 0 9 + -1b = -12 + 0 9 + -1b = -12 Add '-9' to each side of the equation. 9 + -9 + -1b = -12 + -9 Combine like terms: 9 + -9 = 0 0 + -1b = -12 + -9 -1b = -12 + -9 Combine like terms: -12 + -9 = -21 -1b = -21 Divide each side by '-1'. b = 21 Simplifying b = 21
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