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Simplifying a + -1(4a + 1) = -13 Reorder the terms: a + -1(1 + 4a) = -13 a + (1 * -1 + 4a * -1) = -13 a + (-1 + -4a) = -13 Reorder the terms: -1 + a + -4a = -13 Combine like terms: a + -4a = -3a -1 + -3a = -13 Solving -1 + -3a = -13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -3a = -13 + 1 Combine like terms: -1 + 1 = 0 0 + -3a = -13 + 1 -3a = -13 + 1 Combine like terms: -13 + 1 = -12 -3a = -12 Divide each side by '-3'. a = 4 Simplifying a = 4
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