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Simplifying 21 + -6a = 69 + 2a Solving 21 + -6a = 69 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 21 + -6a + -2a = 69 + 2a + -2a Combine like terms: -6a + -2a = -8a 21 + -8a = 69 + 2a + -2a Combine like terms: 2a + -2a = 0 21 + -8a = 69 + 0 21 + -8a = 69 Add '-21' to each side of the equation. 21 + -21 + -8a = 69 + -21 Combine like terms: 21 + -21 = 0 0 + -8a = 69 + -21 -8a = 69 + -21 Combine like terms: 69 + -21 = 48 -8a = 48 Divide each side by '-8'. a = -6 Simplifying a = -6
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