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Simplifying 7 + 4(2a + 1) = -13 Reorder the terms: 7 + 4(1 + 2a) = -13 7 + (1 * 4 + 2a * 4) = -13 7 + (4 + 8a) = -13 Combine like terms: 7 + 4 = 11 11 + 8a = -13 Solving 11 + 8a = -13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + 8a = -13 + -11 Combine like terms: 11 + -11 = 0 0 + 8a = -13 + -11 8a = -13 + -11 Combine like terms: -13 + -11 = -24 8a = -24 Divide each side by '8'. a = -3 Simplifying a = -3
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