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Simplifying -21 = 99 + -15 + -3a Combine like terms: 99 + -15 = 84 -21 = 84 + -3a Solving -21 = 84 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. -21 + 3a = 84 + -3a + 3a Combine like terms: -3a + 3a = 0 -21 + 3a = 84 + 0 -21 + 3a = 84 Add '21' to each side of the equation. -21 + 21 + 3a = 84 + 21 Combine like terms: -21 + 21 = 0 0 + 3a = 84 + 21 3a = 84 + 21 Combine like terms: 84 + 21 = 105 3a = 105 Divide each side by '3'. a = 35 Simplifying a = 35
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