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Simplifying 7x + 4 = -2x + 4 + 9x Reorder the terms: 4 + 7x = -2x + 4 + 9x Reorder the terms: 4 + 7x = 4 + -2x + 9x Combine like terms: -2x + 9x = 7x 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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