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Simplifying 13 = 5 + 13 + 3a Combine like terms: 5 + 13 = 18 13 = 18 + 3a Solving 13 = 18 + 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 = 18 + 3a + -3a Combine like terms: 3a + -3a = 0 13 + -3a = 18 + 0 13 + -3a = 18 Add '-13' to each side of the equation. 13 + -13 + -3a = 18 + -13 Combine like terms: 13 + -13 = 0 0 + -3a = 18 + -13 -3a = 18 + -13 Combine like terms: 18 + -13 = 5 -3a = 5 Divide each side by '-3'. a = -1.666666667 Simplifying a = -1.666666667
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