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Simplifying 19a + -18a + 7 = -13 Reorder the terms: 7 + 19a + -18a = -13 Combine like terms: 19a + -18a = 1a 7 + 1a = -13 Solving 7 + 1a = -13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 1a = -13 + -7 Combine like terms: 7 + -7 = 0 0 + 1a = -13 + -7 1a = -13 + -7 Combine like terms: -13 + -7 = -20 1a = -20 Divide each side by '1'. a = -20 Simplifying a = -20
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