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Simplifying 3 + 3(-4 + -3a) = -81 3 + (-4 * 3 + -3a * 3) = -81 3 + (-12 + -9a) = -81 Combine like terms: 3 + -12 = -9 -9 + -9a = -81 Solving -9 + -9a = -81 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -9a = -81 + 9 Combine like terms: -9 + 9 = 0 0 + -9a = -81 + 9 -9a = -81 + 9 Combine like terms: -81 + 9 = -72 -9a = -72 Divide each side by '-9'. a = 8 Simplifying a = 8
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