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Simplifying 21 = 15 + 2a Solving 21 = 15 + 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 = 15 + 2a + -2a Combine like terms: 2a + -2a = 0 21 + -2a = 15 + 0 21 + -2a = 15 Add '-21' to each side of the equation. 21 + -21 + -2a = 15 + -21 Combine like terms: 21 + -21 = 0 0 + -2a = 15 + -21 -2a = 15 + -21 Combine like terms: 15 + -21 = -6 -2a = -6 Divide each side by '-2'. a = 3 Simplifying a = 3
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