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