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Simplifying 138 = -3(-7b + -2) + 6 Reorder the terms: 138 = -3(-2 + -7b) + 6 138 = (-2 * -3 + -7b * -3) + 6 138 = (6 + 21b) + 6 Reorder the terms: 138 = 6 + 6 + 21b Combine like terms: 6 + 6 = 12 138 = 12 + 21b Solving 138 = 12 + 21b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-21b' to each side of the equation. 138 + -21b = 12 + 21b + -21b Combine like terms: 21b + -21b = 0 138 + -21b = 12 + 0 138 + -21b = 12 Add '-138' to each side of the equation. 138 + -138 + -21b = 12 + -138 Combine like terms: 138 + -138 = 0 0 + -21b = 12 + -138 -21b = 12 + -138 Combine like terms: 12 + -138 = -126 -21b = -126 Divide each side by '-21'. b = 6 Simplifying b = 6
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