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Simplifying 66 + -9a = 2(19 + -39) Combine like terms: 19 + -39 = -20 66 + -9a = 2(-20) Multiply 2 * -20 66 + -9a = -40 Solving 66 + -9a = -40 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-66' to each side of the equation. 66 + -66 + -9a = -40 + -66 Combine like terms: 66 + -66 = 0 0 + -9a = -40 + -66 -9a = -40 + -66 Combine like terms: -40 + -66 = -106 -9a = -106 Divide each side by '-9'. a = 11.77777778 Simplifying a = 11.77777778
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