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Simplifying 19 = 21a + -13 + -5a Reorder the terms: 19 = -13 + 21a + -5a Combine like terms: 21a + -5a = 16a 19 = -13 + 16a Solving 19 = -13 + 16a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-16a' to each side of the equation. 19 + -16a = -13 + 16a + -16a Combine like terms: 16a + -16a = 0 19 + -16a = -13 + 0 19 + -16a = -13 Add '-19' to each side of the equation. 19 + -19 + -16a = -13 + -19 Combine like terms: 19 + -19 = 0 0 + -16a = -13 + -19 -16a = -13 + -19 Combine like terms: -13 + -19 = -32 -16a = -32 Divide each side by '-16'. a = 2 Simplifying a = 2
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