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Simplifying -90 = -3(8 + 3a) + -3 -90 = (8 * -3 + 3a * -3) + -3 -90 = (-24 + -9a) + -3 Reorder the terms: -90 = -24 + -3 + -9a Combine like terms: -24 + -3 = -27 -90 = -27 + -9a Solving -90 = -27 + -9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9a' to each side of the equation. -90 + 9a = -27 + -9a + 9a Combine like terms: -9a + 9a = 0 -90 + 9a = -27 + 0 -90 + 9a = -27 Add '90' to each side of the equation. -90 + 90 + 9a = -27 + 90 Combine like terms: -90 + 90 = 0 0 + 9a = -27 + 90 9a = -27 + 90 Combine like terms: -27 + 90 = 63 9a = 63 Divide each side by '9'. a = 7 Simplifying a = 7
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