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Simplifying 2 + -7r + 7 = 2r + -9(r + -1) Reorder the terms: 2 + 7 + -7r = 2r + -9(r + -1) Combine like terms: 2 + 7 = 9 9 + -7r = 2r + -9(r + -1) Reorder the terms: 9 + -7r = 2r + -9(-1 + r) 9 + -7r = 2r + (-1 * -9 + r * -9) 9 + -7r = 2r + (9 + -9r) Reorder the terms: 9 + -7r = 9 + 2r + -9r Combine like terms: 2r + -9r = -7r 9 + -7r = 9 + -7r Add '-9' to each side of the equation. 9 + -9 + -7r = 9 + -9 + -7r Combine like terms: 9 + -9 = 0 0 + -7r = 9 + -9 + -7r -7r = 9 + -9 + -7r Combine like terms: 9 + -9 = 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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