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Simplifying 5a + 20(a + 1) = 7 Reorder the terms: 5a + 20(1 + a) = 7 5a + (1 * 20 + a * 20) = 7 5a + (20 + 20a) = 7 Reorder the terms: 20 + 5a + 20a = 7 Combine like terms: 5a + 20a = 25a 20 + 25a = 7 Solving 20 + 25a = 7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 25a = 7 + -20 Combine like terms: 20 + -20 = 0 0 + 25a = 7 + -20 25a = 7 + -20 Combine like terms: 7 + -20 = -13 25a = -13 Divide each side by '25'. a = -0.52 Simplifying a = -0.52
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