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Simplifying -10(13) + 220 = 90 Multiply -10 * 13 -130 + 220 = 90 Combine like terms: -130 + 220 = 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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