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Simplifying 6x + 7y + x + -8y = 7x + -1y Reorder the terms: 6x + x + 7y + -8y = 7x + -1y Combine like terms: 6x + x = 7x 7x + 7y + -8y = 7x + -1y Combine like terms: 7y + -8y = -1y 7x + -1y = 7x + -1y Add '-7x' to each side of the equation. 7x + -7x + -1y = 7x + -7x + -1y Combine like terms: 7x + -7x = 0 0 + -1y = 7x + -7x + -1y -1y = 7x + -7x + -1y Combine like terms: 7x + -7x = 0 -1y = 0 + -1y -1y = -1y Add 'y' to each side of the equation. -1y + y = -1y + y Combine like terms: -1y + y = 0 0 = -1y + y Combine like terms: -1y + y = 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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