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Simplifying 21 + -6x = 5 + -6x Add '6x' to each side of the equation. 21 + -6x + 6x = 5 + -6x + 6x Combine like terms: -6x + 6x = 0 21 + 0 = 5 + -6x + 6x 21 = 5 + -6x + 6x Combine like terms: -6x + 6x = 0 21 = 5 + 0 21 = 5 Solving 21 = 5 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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