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Simplifying -21 = 7 + -2a Solving -21 = 7 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. -21 + 2a = 7 + -2a + 2a Combine like terms: -2a + 2a = 0 -21 + 2a = 7 + 0 -21 + 2a = 7 Add '21' to each side of the equation. -21 + 21 + 2a = 7 + 21 Combine like terms: -21 + 21 = 0 0 + 2a = 7 + 21 2a = 7 + 21 Combine like terms: 7 + 21 = 28 2a = 28 Divide each side by '2'. a = 14 Simplifying a = 14
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