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Simplifying 4(a + 3) + -7 = 21 Reorder the terms: 4(3 + a) + -7 = 21 (3 * 4 + a * 4) + -7 = 21 (12 + 4a) + -7 = 21 Reorder the terms: 12 + -7 + 4a = 21 Combine like terms: 12 + -7 = 5 5 + 4a = 21 Solving 5 + 4a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 4a = 21 + -5 Combine like terms: 5 + -5 = 0 0 + 4a = 21 + -5 4a = 21 + -5 Combine like terms: 21 + -5 = 16 4a = 16 Divide each side by '4'. a = 4 Simplifying a = 4
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