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Simplifying 2(39 + -2.5y) + 5y = 78 (39 * 2 + -2.5y * 2) + 5y = 78 (78 + -5y) + 5y = 78 Combine like terms: -5y + 5y = 0 78 + 0 = 78 78 = 78 Add '-78' to each side of the equation. 78 + -78 = 78 + -78 Combine like terms: 78 + -78 = 0 0 = 78 + -78 Combine like terms: 78 + -78 = 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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