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Simplifying 13 = 15 + -13 + 3a Combine like terms: 15 + -13 = 2 13 = 2 + 3a Solving 13 = 2 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 13 + -3a = 2 + 3a + -3a Combine like terms: 3a + -3a = 0 13 + -3a = 2 + 0 13 + -3a = 2 Add '-13' to each side of the equation. 13 + -13 + -3a = 2 + -13 Combine like terms: 13 + -13 = 0 0 + -3a = 2 + -13 -3a = 2 + -13 Combine like terms: 2 + -13 = -11 -3a = -11 Divide each side by '-3'. a = 3.666666667 Simplifying a = 3.666666667
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