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Simplifying 4 + a + 2 = 21 + -2a Reorder the terms: 4 + 2 + a = 21 + -2a Combine like terms: 4 + 2 = 6 6 + a = 21 + -2a Solving 6 + a = 21 + -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. 6 + a + 2a = 21 + -2a + 2a Combine like terms: a + 2a = 3a 6 + 3a = 21 + -2a + 2a Combine like terms: -2a + 2a = 0 6 + 3a = 21 + 0 6 + 3a = 21 Add '-6' to each side of the equation. 6 + -6 + 3a = 21 + -6 Combine like terms: 6 + -6 = 0 0 + 3a = 21 + -6 3a = 21 + -6 Combine like terms: 21 + -6 = 15 3a = 15 Divide each side by '3'. a = 5 Simplifying a = 5
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