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Simplifying -7(a + 3) = 0 Reorder the terms: -7(3 + a) = 0 (3 * -7 + a * -7) = 0 (-21 + -7a) = 0 Solving -21 + -7a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -7a = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -7a = 0 + 21 -7a = 0 + 21 Combine like terms: 0 + 21 = 21 -7a = 21 Divide each side by '-7'. a = -3 Simplifying a = -3
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