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Simplifying 7(5a + -3) = 84 Reorder the terms: 7(-3 + 5a) = 84 (-3 * 7 + 5a * 7) = 84 (-21 + 35a) = 84 Solving -21 + 35a = 84 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 35a = 84 + 21 Combine like terms: -21 + 21 = 0 0 + 35a = 84 + 21 35a = 84 + 21 Combine like terms: 84 + 21 = 105 35a = 105 Divide each side by '35'. a = 3 Simplifying a = 3
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