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Simplifying 13 + 5b + 7b = 5b + -7 + 2b Combine like terms: 5b + 7b = 12b 13 + 12b = 5b + -7 + 2b Reorder the terms: 13 + 12b = -7 + 5b + 2b Combine like terms: 5b + 2b = 7b 13 + 12b = -7 + 7b Solving 13 + 12b = -7 + 7b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-7b' to each side of the equation. 13 + 12b + -7b = -7 + 7b + -7b Combine like terms: 12b + -7b = 5b 13 + 5b = -7 + 7b + -7b Combine like terms: 7b + -7b = 0 13 + 5b = -7 + 0 13 + 5b = -7 Add '-13' to each side of the equation. 13 + -13 + 5b = -7 + -13 Combine like terms: 13 + -13 = 0 0 + 5b = -7 + -13 5b = -7 + -13 Combine like terms: -7 + -13 = -20 5b = -20 Divide each side by '5'. b = -4 Simplifying b = -4
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