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Simplifying 81x + -20 + -9x = 19 + 72x + -39 Reorder the terms: -20 + 81x + -9x = 19 + 72x + -39 Combine like terms: 81x + -9x = 72x -20 + 72x = 19 + 72x + -39 Reorder the terms: -20 + 72x = 19 + -39 + 72x Combine like terms: 19 + -39 = -20 -20 + 72x = -20 + 72x Add '20' to each side of the equation. -20 + 20 + 72x = -20 + 20 + 72x Combine like terms: -20 + 20 = 0 0 + 72x = -20 + 20 + 72x 72x = -20 + 20 + 72x Combine like terms: -20 + 20 = 0 72x = 0 + 72x 72x = 72x Add '-72x' to each side of the equation. 72x + -72x = 72x + -72x Combine like terms: 72x + -72x = 0 0 = 72x + -72x Combine like terms: 72x + -72x = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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