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Simplifying 21 + -1 = 5a + -2a + 4a Combine like terms: 21 + -1 = 20 20 = 5a + -2a + 4a Combine like terms: 5a + -2a = 3a 20 = 3a + 4a Combine like terms: 3a + 4a = 7a 20 = 7a Solving 20 = 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. 20 + -7a = 7a + -7a Combine like terms: 7a + -7a = 0 20 + -7a = 0 Add '-20' to each side of the equation. 20 + -20 + -7a = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -7a = 0 + -20 -7a = 0 + -20 Combine like terms: 0 + -20 = -20 -7a = -20 Divide each side by '-7'. a = 2.857142857 Simplifying a = 2.857142857
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