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Simplifying 7(4 + 8) = -15 + -3a Combine like terms: 4 + 8 = 12 7(12) = -15 + -3a Multiply 7 * 12 84 = -15 + -3a Solving 84 = -15 + -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. 84 + 3a = -15 + -3a + 3a Combine like terms: -3a + 3a = 0 84 + 3a = -15 + 0 84 + 3a = -15 Add '-84' to each side of the equation. 84 + -84 + 3a = -15 + -84 Combine like terms: 84 + -84 = 0 0 + 3a = -15 + -84 3a = -15 + -84 Combine like terms: -15 + -84 = -99 3a = -99 Divide each side by '3'. a = -33 Simplifying a = -33
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