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Simplifying 21 + -2a = a + -6 Reorder the terms: 21 + -2a = -6 + a Solving 21 + -2a = -6 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. 21 + -2a + -1a = -6 + a + -1a Combine like terms: -2a + -1a = -3a 21 + -3a = -6 + a + -1a Combine like terms: a + -1a = 0 21 + -3a = -6 + 0 21 + -3a = -6 Add '-21' to each side of the equation. 21 + -21 + -3a = -6 + -21 Combine like terms: 21 + -21 = 0 0 + -3a = -6 + -21 -3a = -6 + -21 Combine like terms: -6 + -21 = -27 -3a = -27 Divide each side by '-3'. a = 9 Simplifying a = 9
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