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Simplifying 9r + -9 = -3(-3r + 3) Reorder the terms: -9 + 9r = -3(-3r + 3) Reorder the terms: -9 + 9r = -3(3 + -3r) -9 + 9r = (3 * -3 + -3r * -3) -9 + 9r = (-9 + 9r) Add '9' to each side of the equation. -9 + 9 + 9r = -9 + 9 + 9r Combine like terms: -9 + 9 = 0 0 + 9r = -9 + 9 + 9r 9r = -9 + 9 + 9r Combine like terms: -9 + 9 = 0 9r = 0 + 9r 9r = 9r Add '-9r' to each side of the equation. 9r + -9r = 9r + -9r Combine like terms: 9r + -9r = 0 0 = 9r + -9r Combine like terms: 9r + -9r = 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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