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Simplifying 7(7a + -9) = 84 Reorder the terms: 7(-9 + 7a) = 84 (-9 * 7 + 7a * 7) = 84 (-63 + 49a) = 84 Solving -63 + 49a = 84 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 49a = 84 + 63 Combine like terms: -63 + 63 = 0 0 + 49a = 84 + 63 49a = 84 + 63 Combine like terms: 84 + 63 = 147 49a = 147 Divide each side by '49'. a = 3 Simplifying a = 3
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