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Simplifying 19 = 12 + -7a Solving 19 = 12 + -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. 19 + 7a = 12 + -7a + 7a Combine like terms: -7a + 7a = 0 19 + 7a = 12 + 0 19 + 7a = 12 Add '-19' to each side of the equation. 19 + -19 + 7a = 12 + -19 Combine like terms: 19 + -19 = 0 0 + 7a = 12 + -19 7a = 12 + -19 Combine like terms: 12 + -19 = -7 7a = -7 Divide each side by '7'. a = -1 Simplifying a = -1
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