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Simplifying 21 = 7B + 7 Reorder the terms: 21 = 7 + 7B Solving 21 = 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. 21 + -7B = 7 + 7B + -7B Combine like terms: 7B + -7B = 0 21 + -7B = 7 + 0 21 + -7B = 7 Add '-21' to each side of the equation. 21 + -21 + -7B = 7 + -21 Combine like terms: 21 + -21 = 0 0 + -7B = 7 + -21 -7B = 7 + -21 Combine like terms: 7 + -21 = -14 -7B = -14 Divide each side by '-7'. B = 2 Simplifying B = 2
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