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Simplifying -21 = a + -1 Reorder the terms: -21 = -1 + a Solving -21 = -1 + 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. -21 + -1a = -1 + a + -1a Combine like terms: a + -1a = 0 -21 + -1a = -1 + 0 -21 + -1a = -1 Add '21' to each side of the equation. -21 + 21 + -1a = -1 + 21 Combine like terms: -21 + 21 = 0 0 + -1a = -1 + 21 -1a = -1 + 21 Combine like terms: -1 + 21 = 20 -1a = 20 Divide each side by '-1'. a = -20 Simplifying a = -20
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