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