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Simplifying 66 + -9a = 2(19 + -3a) 66 + -9a = (19 * 2 + -3a * 2) 66 + -9a = (38 + -6a) Solving 66 + -9a = 38 + -6a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6a' to each side of the equation. 66 + -9a + 6a = 38 + -6a + 6a Combine like terms: -9a + 6a = -3a 66 + -3a = 38 + -6a + 6a Combine like terms: -6a + 6a = 0 66 + -3a = 38 + 0 66 + -3a = 38 Add '-66' to each side of the equation. 66 + -66 + -3a = 38 + -66 Combine like terms: 66 + -66 = 0 0 + -3a = 38 + -66 -3a = 38 + -66 Combine like terms: 38 + -66 = -28 -3a = -28 Divide each side by '-3'. a = 9.333333333 Simplifying a = 9.333333333
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