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Simplifying 15 + -1(-4) = 19 Multiply -1 * -4 15 + 4 = 19 Combine like terms: 15 + 4 = 19 19 = 19 Add '-19' to each side of the equation. 19 + -19 = 19 + -19 Combine like terms: 19 + -19 = 0 0 = 19 + -19 Combine like terms: 19 + -19 = 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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