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Simplifying 7(a + -2) = -21 Reorder the terms: 7(-2 + a) = -21 (-2 * 7 + a * 7) = -21 (-14 + 7a) = -21 Solving -14 + 7a = -21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + 7a = -21 + 14 Combine like terms: -14 + 14 = 0 0 + 7a = -21 + 14 7a = -21 + 14 Combine like terms: -21 + 14 = -7 7a = -7 Divide each side by '7'. a = -1 Simplifying a = -1
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