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Simplifying -3 + -4r = -1 + -2(1 + 2r) -3 + -4r = -1 + (1 * -2 + 2r * -2) -3 + -4r = -1 + (-2 + -4r) Combine like terms: -1 + -2 = -3 -3 + -4r = -3 + -4r Add '3' to each side of the equation. -3 + 3 + -4r = -3 + 3 + -4r Combine like terms: -3 + 3 = 0 0 + -4r = -3 + 3 + -4r -4r = -3 + 3 + -4r Combine like terms: -3 + 3 = 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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