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Simplifying 13 = 2a + 7 Reorder the terms: 13 = 7 + 2a Solving 13 = 7 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 13 + -2a = 7 + 2a + -2a Combine like terms: 2a + -2a = 0 13 + -2a = 7 + 0 13 + -2a = 7 Add '-13' to each side of the equation. 13 + -13 + -2a = 7 + -13 Combine like terms: 13 + -13 = 0 0 + -2a = 7 + -13 -2a = 7 + -13 Combine like terms: 7 + -13 = -6 -2a = -6 Divide each side by '-2'. a = 3 Simplifying a = 3
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