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Simplifying B + -21 = 2(B + -10) Reorder the terms: -21 + B = 2(B + -10) Reorder the terms: -21 + B = 2(-10 + B) -21 + B = (-10 * 2 + B * 2) -21 + B = (-20 + 2B) Solving -21 + B = -20 + 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. -21 + B + -2B = -20 + 2B + -2B Combine like terms: B + -2B = -1B -21 + -1B = -20 + 2B + -2B Combine like terms: 2B + -2B = 0 -21 + -1B = -20 + 0 -21 + -1B = -20 Add '21' to each side of the equation. -21 + 21 + -1B = -20 + 21 Combine like terms: -21 + 21 = 0 0 + -1B = -20 + 21 -1B = -20 + 21 Combine like terms: -20 + 21 = 1 -1B = 1 Divide each side by '-1'. B = -1 Simplifying B = -1
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