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Simplifying 2x + 5x + -4 = 7x + -4 Reorder the terms: -4 + 2x + 5x = 7x + -4 Combine like terms: 2x + 5x = 7x -4 + 7x = 7x + -4 Reorder the terms: -4 + 7x = -4 + 7x Add '4' to each side of the equation. -4 + 4 + 7x = -4 + 4 + 7x Combine like terms: -4 + 4 = 0 0 + 7x = -4 + 4 + 7x 7x = -4 + 4 + 7x Combine like terms: -4 + 4 = 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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