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Simplifying 7 + -1y = 9 + -1(y + 2) Reorder the terms: 7 + -1y = 9 + -1(2 + y) 7 + -1y = 9 + (2 * -1 + y * -1) 7 + -1y = 9 + (-2 + -1y) Combine like terms: 9 + -2 = 7 7 + -1y = 7 + -1y Add '-7' to each side of the equation. 7 + -7 + -1y = 7 + -7 + -1y Combine like terms: 7 + -7 = 0 0 + -1y = 7 + -7 + -1y -1y = 7 + -7 + -1y Combine like terms: 7 + -7 = 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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