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Simplifying 21 + 2y + (69 + -2y) = 90 Remove parenthesis around (69 + -2y) 21 + 2y + 69 + -2y = 90 Reorder the terms: 21 + 69 + 2y + -2y = 90 Combine like terms: 21 + 69 = 90 90 + 2y + -2y = 90 Combine like terms: 2y + -2y = 0 90 + 0 = 90 90 = 90 Add '-90' to each side of the equation. 90 + -90 = 90 + -90 Combine like terms: 90 + -90 = 0 0 = 90 + -90 Combine like terms: 90 + -90 = 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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