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Simplifying -7(a + 4) = -84 Reorder the terms: -7(4 + a) = -84 (4 * -7 + a * -7) = -84 (-28 + -7a) = -84 Solving -28 + -7a = -84 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + -7a = -84 + 28 Combine like terms: -28 + 28 = 0 0 + -7a = -84 + 28 -7a = -84 + 28 Combine like terms: -84 + 28 = -56 -7a = -56 Divide each side by '-7'. a = 8 Simplifying a = 8
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