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