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Simplifying 10r + 15 + -3r = 15 + 7r Reorder the terms: 15 + 10r + -3r = 15 + 7r Combine like terms: 10r + -3r = 7r 15 + 7r = 15 + 7r Add '-15' to each side of the equation. 15 + -15 + 7r = 15 + -15 + 7r Combine like terms: 15 + -15 = 0 0 + 7r = 15 + -15 + 7r 7r = 15 + -15 + 7r Combine like terms: 15 + -15 = 0 7r = 0 + 7r 7r = 7r Add '-7r' to each side of the equation. 7r + -7r = 7r + -7r Combine like terms: 7r + -7r = 0 0 = 7r + -7r Combine like terms: 7r + -7r = 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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