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Simplifying (7a) + 16 + -1(3a) = -4 Remove parenthesis around (3a) (7a) + 16 + -1 * 3a = -4 Multiply -1 * 3 (7a) + 16 + -3a = -4 Reorder the terms: 16 + (7a) + -3a = -4 Combine like terms: (7a) + -3a = 4a 16 + 4a = -4 Solving 16 + 4a = -4 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + 4a = -4 + -16 Combine like terms: 16 + -16 = 0 0 + 4a = -4 + -16 4a = -4 + -16 Combine like terms: -4 + -16 = -20 4a = -20 Divide each side by '4'. a = -5 Simplifying a = -5
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