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Simplifying 18 + -7a + 1 = -9 Reorder the terms: 18 + 1 + -7a = -9 Combine like terms: 18 + 1 = 19 19 + -7a = -9 Solving 19 + -7a = -9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-19' to each side of the equation. 19 + -19 + -7a = -9 + -19 Combine like terms: 19 + -19 = 0 0 + -7a = -9 + -19 -7a = -9 + -19 Combine like terms: -9 + -19 = -28 -7a = -28 Divide each side by '-7'. a = 4 Simplifying a = 4
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