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Simplifying 15 + 4a = -1 Solving 15 + 4a = -1 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 4a = -1 + -15 Combine like terms: 15 + -15 = 0 0 + 4a = -1 + -15 4a = -1 + -15 Combine like terms: -1 + -15 = -16 4a = -16 Divide each side by '4'. a = -4 Simplifying a = -4
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