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Simplifying -15 + 25(21) = 6 + 24(21) Multiply 25 * 21 -15 + 525 = 6 + 24(21) Combine like terms: -15 + 525 = 510 510 = 6 + 24(21) Multiply 24 * 21 510 = 6 + 504 Combine like terms: 6 + 504 = 510 510 = 510 Add '-510' to each side of the equation. 510 + -510 = 510 + -510 Combine like terms: 510 + -510 = 0 0 = 510 + -510 Combine like terms: 510 + -510 = 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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