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Simplifying 13a + -3(a + -6) = 66 Reorder the terms: 13a + -3(-6 + a) = 66 13a + (-6 * -3 + a * -3) = 66 13a + (18 + -3a) = 66 Reorder the terms: 18 + 13a + -3a = 66 Combine like terms: 13a + -3a = 10a 18 + 10a = 66 Solving 18 + 10a = 66 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 10a = 66 + -18 Combine like terms: 18 + -18 = 0 0 + 10a = 66 + -18 10a = 66 + -18 Combine like terms: 66 + -18 = 48 10a = 48 Divide each side by '10'. a = 4.8 Simplifying a = 4.8
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