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Simplifying 129 = 2b + -15 Reorder the terms: 129 = -15 + 2b Solving 129 = -15 + 2b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2b' to each side of the equation. 129 + -2b = -15 + 2b + -2b Combine like terms: 2b + -2b = 0 129 + -2b = -15 + 0 129 + -2b = -15 Add '-129' to each side of the equation. 129 + -129 + -2b = -15 + -129 Combine like terms: 129 + -129 = 0 0 + -2b = -15 + -129 -2b = -15 + -129 Combine like terms: -15 + -129 = -144 -2b = -144 Divide each side by '-2'. b = 72 Simplifying b = 72
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