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Simplifying (6a + -13) + -1(-15a + -15) = 0 Reorder the terms: (-13 + 6a) + -1(-15a + -15) = 0 Remove parenthesis around (-13 + 6a) -13 + 6a + -1(-15a + -15) = 0 Reorder the terms: -13 + 6a + -1(-15 + -15a) = 0 -13 + 6a + (-15 * -1 + -15a * -1) = 0 -13 + 6a + (15 + 15a) = 0 Reorder the terms: -13 + 15 + 6a + 15a = 0 Combine like terms: -13 + 15 = 2 2 + 6a + 15a = 0 Combine like terms: 6a + 15a = 21a 2 + 21a = 0 Solving 2 + 21a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 21a = 0 + -2 Combine like terms: 2 + -2 = 0 0 + 21a = 0 + -2 21a = 0 + -2 Combine like terms: 0 + -2 = -2 21a = -2 Divide each side by '21'. a = -0.09523809524 Simplifying a = -0.09523809524
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