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Simplifying 19 = -21 + a Solving 19 = -21 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. 19 + -1a = -21 + a + -1a Combine like terms: a + -1a = 0 19 + -1a = -21 + 0 19 + -1a = -21 Add '-19' to each side of the equation. 19 + -19 + -1a = -21 + -19 Combine like terms: 19 + -19 = 0 0 + -1a = -21 + -19 -1a = -21 + -19 Combine like terms: -21 + -19 = -40 -1a = -40 Divide each side by '-1'. a = 40 Simplifying a = 40
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