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Simplifying 3a + -1(-1) = -13 Multiply -1 * -1 3a + 1 = -13 Reorder the terms: 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 = -14 3a = -14 Divide each side by '3'. a = -4.666666667 Simplifying a = -4.666666667
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