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Simplifying (-20) + -1(-20) = 0 -20 + -1(-20) = 0 Multiply -1 * -20 -20 + 20 = 0 Combine like terms: -20 + 20 = 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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