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Simplifying 2a + -1(6 + -1a) = 13 + 2r 2a + (6 * -1 + -1a * -1) = 13 + 2r 2a + (-6 + 1a) = 13 + 2r Reorder the terms: -6 + 2a + 1a = 13 + 2r Combine like terms: 2a + 1a = 3a -6 + 3a = 13 + 2r Solving -6 + 3a = 13 + 2r Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 3a = 13 + 6 + 2r Combine like terms: -6 + 6 = 0 0 + 3a = 13 + 6 + 2r 3a = 13 + 6 + 2r Combine like terms: 13 + 6 = 19 3a = 19 + 2r Divide each side by '3'. a = 6.333333333 + 0.6666666667r Simplifying a = 6.333333333 + 0.6666666667r
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