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Simplifying 13 = 5 + -13 + -3a Combine like terms: 5 + -13 = -8 13 = -8 + -3a Solving 13 = -8 + -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 = -8 + -3a + 3a Combine like terms: -3a + 3a = 0 13 + 3a = -8 + 0 13 + 3a = -8 Add '-13' to each side of the equation. 13 + -13 + 3a = -8 + -13 Combine like terms: 13 + -13 = 0 0 + 3a = -8 + -13 3a = -8 + -13 Combine like terms: -8 + -13 = -21 3a = -21 Divide each side by '3'. a = -7 Simplifying a = -7
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