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Simplifying 12 + a + a = 13a Combine like terms: a + a = 2a 12 + 2a = 13a Solving 12 + 2a = 13a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-13a' to each side of the equation. 12 + 2a + -13a = 13a + -13a Combine like terms: 2a + -13a = -11a 12 + -11a = 13a + -13a Combine like terms: 13a + -13a = 0 12 + -11a = 0 Add '-12' to each side of the equation. 12 + -12 + -11a = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -11a = 0 + -12 -11a = 0 + -12 Combine like terms: 0 + -12 = -12 -11a = -12 Divide each side by '-11'. a = 1.090909091 Simplifying a = 1.090909091
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