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Simplifying 21 = 2a + 2 Reorder the terms: 21 = 2 + 2a Solving 21 = 2 + 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 = 2 + 2a + -2a Combine like terms: 2a + -2a = 0 21 + -2a = 2 + 0 21 + -2a = 2 Add '-21' to each side of the equation. 21 + -21 + -2a = 2 + -21 Combine like terms: 21 + -21 = 0 0 + -2a = 2 + -21 -2a = 2 + -21 Combine like terms: 2 + -21 = -19 -2a = -19 Divide each side by '-2'. a = 9.5 Simplifying a = 9.5
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