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Simplifying 15 = B + -1(-20) Multiply -1 * -20 15 = B + 20 Reorder the terms: 15 = 20 + B Solving 15 = 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. 15 + -1B = 20 + B + -1B Combine like terms: B + -1B = 0 15 + -1B = 20 + 0 15 + -1B = 20 Add '-15' to each side of the equation. 15 + -15 + -1B = 20 + -15 Combine like terms: 15 + -15 = 0 0 + -1B = 20 + -15 -1B = 20 + -15 Combine like terms: 20 + -15 = 5 -1B = 5 Divide each side by '-1'. B = -5 Simplifying B = -5
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