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Simplifying 7(a + -8) = -21 Reorder the terms: 7(-8 + a) = -21 (-8 * 7 + a * 7) = -21 (-56 + 7a) = -21 Solving -56 + 7a = -21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '56' to each side of the equation. -56 + 56 + 7a = -21 + 56 Combine like terms: -56 + 56 = 0 0 + 7a = -21 + 56 7a = -21 + 56 Combine like terms: -21 + 56 = 35 7a = 35 Divide each side by '7'. a = 5 Simplifying a = 5
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