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Simplifying 13 + -1 + 4a = 4 Combine like terms: 13 + -1 = 12 12 + 4a = 4 Solving 12 + 4a = 4 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 4a = 4 + -12 Combine like terms: 12 + -12 = 0 0 + 4a = 4 + -12 4a = 4 + -12 Combine like terms: 4 + -12 = -8 4a = -8 Divide each side by '4'. a = -2 Simplifying a = -2
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