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Simplifying 20 = 13 + -7a Solving 20 = 13 + -7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7a' to each side of the equation. 20 + 7a = 13 + -7a + 7a Combine like terms: -7a + 7a = 0 20 + 7a = 13 + 0 20 + 7a = 13 Add '-20' to each side of the equation. 20 + -20 + 7a = 13 + -20 Combine like terms: 20 + -20 = 0 0 + 7a = 13 + -20 7a = 13 + -20 Combine like terms: 13 + -20 = -7 7a = -7 Divide each side by '7'. a = -1 Simplifying a = -1
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