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Simplifying 15y + 6(15 + -2.5y) = 90 15y + (15 * 6 + -2.5y * 6) = 90 15y + (90 + -15y) = 90 Reorder the terms: 90 + 15y + -15y = 90 Combine like terms: 15y + -15y = 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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