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Simplifying -9x + -9(-1x + -10) = 90 Reorder the terms: -9x + -9(-10 + -1x) = 90 -9x + (-10 * -9 + -1x * -9) = 90 -9x + (90 + 9x) = 90 Reorder the terms: 90 + -9x + 9x = 90 Combine like terms: -9x + 9x = 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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