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Simplifying 7(3a + 4) = 20 Reorder the terms: 7(4 + 3a) = 20 (4 * 7 + 3a * 7) = 20 (28 + 21a) = 20 Solving 28 + 21a = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 21a = 20 + -28 Combine like terms: 28 + -28 = 0 0 + 21a = 20 + -28 21a = 20 + -28 Combine like terms: 20 + -28 = -8 21a = -8 Divide each side by '21'. a = -0.380952381 Simplifying a = -0.380952381
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