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Simplifying 12a = 19a + -15 + -20 Reorder the terms: 12a = -15 + -20 + 19a Combine like terms: -15 + -20 = -35 12a = -35 + 19a Solving 12a = -35 + 19a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-19a' to each side of the equation. 12a + -19a = -35 + 19a + -19a Combine like terms: 12a + -19a = -7a -7a = -35 + 19a + -19a Combine like terms: 19a + -19a = 0 -7a = -35 + 0 -7a = -35 Divide each side by '-7'. a = 5 Simplifying a = 5
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