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