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Simplifying 9 + -4r = -3(2r + -3) + 2r Reorder the terms: 9 + -4r = -3(-3 + 2r) + 2r 9 + -4r = (-3 * -3 + 2r * -3) + 2r 9 + -4r = (9 + -6r) + 2r Combine like terms: -6r + 2r = -4r 9 + -4r = 9 + -4r Add '-9' to each side of the equation. 9 + -9 + -4r = 9 + -9 + -4r Combine like terms: 9 + -9 = 0 0 + -4r = 9 + -9 + -4r -4r = 9 + -9 + -4r Combine like terms: 9 + -9 = 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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