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Simplifying 28 + -7r = 7(4 + -1r) 28 + -7r = (4 * 7 + -1r * 7) 28 + -7r = (28 + -7r) Add '-28' to each side of the equation. 28 + -28 + -7r = 28 + -28 + -7r Combine like terms: 28 + -28 = 0 0 + -7r = 28 + -28 + -7r -7r = 28 + -28 + -7r Combine like terms: 28 + -28 = 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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