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Simplifying (13a + 1)(-3) = -91 Reorder the terms: (1 + 13a)(-3) = -91 Reorder the terms for easier multiplication: -3(1 + 13a) = -91 (1 * -3 + 13a * -3) = -91 (-3 + -39a) = -91 Solving -3 + -39a = -91 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 = -91 + 3 Combine like terms: -3 + 3 = 0 0 + -39a = -91 + 3 -39a = -91 + 3 Combine like terms: -91 + 3 = -88 -39a = -88 Divide each side by '-39'. a = 2.256410256 Simplifying a = 2.256410256
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