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Simplifying (13a + 1)(-3) = -81 Reorder the terms: (1 + 13a)(-3) = -81 Reorder the terms for easier multiplication: -3(1 + 13a) = -81 (1 * -3 + 13a * -3) = -81 (-3 + -39a) = -81 Solving -3 + -39a = -81 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -39a = -81 + 3 Combine like terms: -3 + 3 = 0 0 + -39a = -81 + 3 -39a = -81 + 3 Combine like terms: -81 + 3 = -78 -39a = -78 Divide each side by '-39'. a = 2 Simplifying a = 2
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