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Simplifying 21(7 + -1b) + 12b = 210 (7 * 21 + -1b * 21) + 12b = 210 (147 + -21b) + 12b = 210 Combine like terms: -21b + 12b = -9b 147 + -9b = 210 Solving 147 + -9b = 210 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-147' to each side of the equation. 147 + -147 + -9b = 210 + -147 Combine like terms: 147 + -147 = 0 0 + -9b = 210 + -147 -9b = 210 + -147 Combine like terms: 210 + -147 = 63 -9b = 63 Divide each side by '-9'. b = -7 Simplifying b = -7
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