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Simplifying -21 = -2a + -10 + a Reorder the terms: -21 = -10 + -2a + a Combine like terms: -2a + a = -1a -21 = -10 + -1a Solving -21 = -10 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. -21 + a = -10 + -1a + a Combine like terms: -1a + a = 0 -21 + a = -10 + 0 -21 + a = -10 Add '21' to each side of the equation. -21 + 21 + a = -10 + 21 Combine like terms: -21 + 21 = 0 0 + a = -10 + 21 a = -10 + 21 Combine like terms: -10 + 21 = 11 a = 11 Simplifying a = 11
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