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Simplifying 9 + -1(-11) + -7a = -1 Multiply -1 * -11 9 + 11 + -7a = -1 Combine like terms: 9 + 11 = 20 20 + -7a = -1 Solving 20 + -7a = -1 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -7a = -1 + -20 Combine like terms: 20 + -20 = 0 0 + -7a = -1 + -20 -7a = -1 + -20 Combine like terms: -1 + -20 = -21 -7a = -21 Divide each side by '-7'. a = 3 Simplifying a = 3
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