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Simplifying 4(x + 5) = 21 + 4x Reorder the terms: 4(5 + x) = 21 + 4x (5 * 4 + x * 4) = 21 + 4x (20 + 4x) = 21 + 4x Add '-4x' to each side of the equation. 20 + 4x + -4x = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 20 + 0 = 21 + 4x + -4x 20 = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 20 = 21 + 0 20 = 21 Solving 20 = 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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