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Simplifying 7(a + -16) = 21 Reorder the terms: 7(-16 + a) = 21 (-16 * 7 + a * 7) = 21 (-112 + 7a) = 21 Solving -112 + 7a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '112' to each side of the equation. -112 + 112 + 7a = 21 + 112 Combine like terms: -112 + 112 = 0 0 + 7a = 21 + 112 7a = 21 + 112 Combine like terms: 21 + 112 = 133 7a = 133 Divide each side by '7'. a = 19 Simplifying a = 19
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