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Simplifying -2(a + -7) = -28 Reorder the terms: -2(-7 + a) = -28 (-7 * -2 + a * -2) = -28 (14 + -2a) = -28 Solving 14 + -2a = -28 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 + -2a = -28 + -14 Combine like terms: 14 + -14 = 0 0 + -2a = -28 + -14 -2a = -28 + -14 Combine like terms: -28 + -14 = -42 -2a = -42 Divide each side by '-2'. a = 21 Simplifying a = 21
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