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Simplifying -1a + 7 + 5(-4 + 7a) = 0 -1a + 7 + (-4 * 5 + 7a * 5) = 0 -1a + 7 + (-20 + 35a) = 0 Reorder the terms: 7 + -20 + -1a + 35a = 0 Combine like terms: 7 + -20 = -13 -13 + -1a + 35a = 0 Combine like terms: -1a + 35a = 34a -13 + 34a = 0 Solving -13 + 34a = 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 + 34a = 0 + 13 Combine like terms: -13 + 13 = 0 0 + 34a = 0 + 13 34a = 0 + 13 Combine like terms: 0 + 13 = 13 34a = 13 Divide each side by '34'. a = 0.3823529412 Simplifying a = 0.3823529412
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