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