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Simplifying 13 + 4a = 21 Solving 13 + 4a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 4a = 21 + -13 Combine like terms: 13 + -13 = 0 0 + 4a = 21 + -13 4a = 21 + -13 Combine like terms: 21 + -13 = 8 4a = 8 Divide each side by '4'. a = 2 Simplifying a = 2
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