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Simplifying 7x + 21 = 7x + 42 Reorder the terms: 21 + 7x = 7x + 42 Reorder the terms: 21 + 7x = 42 + 7x Add '-7x' to each side of the equation. 21 + 7x + -7x = 42 + 7x + -7x Combine like terms: 7x + -7x = 0 21 + 0 = 42 + 7x + -7x 21 = 42 + 7x + -7x Combine like terms: 7x + -7x = 0 21 = 42 + 0 21 = 42 Solving 21 = 42 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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