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Simplifying 1 + -7a + 4 = -23 Reorder the terms: 1 + 4 + -7a = -23 Combine like terms: 1 + 4 = 5 5 + -7a = -23 Solving 5 + -7a = -23 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -7a = -23 + -5 Combine like terms: 5 + -5 = 0 0 + -7a = -23 + -5 -7a = -23 + -5 Combine like terms: -23 + -5 = -28 -7a = -28 Divide each side by '-7'. a = 4 Simplifying a = 4
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