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Simplifying 13 = b + -1(-20) Multiply -1 * -20 13 = b + 20 Reorder the terms: 13 = 20 + b Solving 13 = 20 + 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. 13 + -1b = 20 + b + -1b Combine like terms: b + -1b = 0 13 + -1b = 20 + 0 13 + -1b = 20 Add '-13' to each side of the equation. 13 + -13 + -1b = 20 + -13 Combine like terms: 13 + -13 = 0 0 + -1b = 20 + -13 -1b = 20 + -13 Combine like terms: 20 + -13 = 7 -1b = 7 Divide each side by '-1'. b = -7 Simplifying b = -7
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