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Simplifying -1a + 7(1 + 3a) + -20 = 0 -1a + (1 * 7 + 3a * 7) + -20 = 0 -1a + (7 + 21a) + -20 = 0 Reorder the terms: 7 + -20 + -1a + 21a = 0 Combine like terms: 7 + -20 = -13 -13 + -1a + 21a = 0 Combine like terms: -1a + 21a = 20a -13 + 20a = 0 Solving -13 + 20a = 0 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 + 20a = 0 + 13 Combine like terms: -13 + 13 = 0 0 + 20a = 0 + 13 20a = 0 + 13 Combine like terms: 0 + 13 = 13 20a = 13 Divide each side by '20'. a = 0.65 Simplifying a = 0.65
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