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