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Simplifying a + -10a + 21 = 0 Reorder the terms: 21 + a + -10a = 0 Combine like terms: a + -10a = -9a 21 + -9a = 0 Solving 21 + -9a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -9a = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -9a = 0 + -21 -9a = 0 + -21 Combine like terms: 0 + -21 = -21 -9a = -21 Divide each side by '-9'. a = 2.333333333 Simplifying a = 2.333333333
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