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Simplifying 2x + 7 + 5x = 7x + 9 + -2 Reorder the terms: 7 + 2x + 5x = 7x + 9 + -2 Combine like terms: 2x + 5x = 7x 7 + 7x = 7x + 9 + -2 Reorder the terms: 7 + 7x = 9 + -2 + 7x Combine like terms: 9 + -2 = 7 7 + 7x = 7 + 7x Add '-7' to each side of the equation. 7 + -7 + 7x = 7 + -7 + 7x Combine like terms: 7 + -7 = 0 0 + 7x = 7 + -7 + 7x 7x = 7 + -7 + 7x Combine like terms: 7 + -7 = 0 7x = 0 + 7x 7x = 7x Add '-7x' to each side of the equation. 7x + -7x = 7x + -7x Combine like terms: 7x + -7x = 0 0 = 7x + -7x Combine like terms: 7x + -7x = 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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