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Simplifying 7(b + 3) = 7(b) + -21 Reorder the terms: 7(3 + b) = 7(b) + -21 (3 * 7 + b * 7) = 7(b) + -21 (21 + 7b) = 7(b) + -21 Reorder the terms: 21 + 7b = -21 + 7b Add '-7b' to each side of the equation. 21 + 7b + -7b = -21 + 7b + -7b Combine like terms: 7b + -7b = 0 21 + 0 = -21 + 7b + -7b 21 = -21 + 7b + -7b Combine like terms: 7b + -7b = 0 21 = -21 + 0 21 = -21 Solving 21 = -21 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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