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Simplifying -1(20 + d) = -20 + -1d (20 * -1 + d * -1) = -20 + -1d (-20 + -1d) = -20 + -1d Add '20' to each side of the equation. -20 + 20 + -1d = -20 + 20 + -1d Combine like terms: -20 + 20 = 0 0 + -1d = -20 + 20 + -1d -1d = -20 + 20 + -1d Combine like terms: -20 + 20 = 0 -1d = 0 + -1d -1d = -1d Add 'd' to each side of the equation. -1d + d = -1d + d Combine like terms: -1d + d = 0 0 = -1d + d Combine like terms: -1d + d = 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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