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Simplifying 21 = 10a + 1 Reorder the terms: 21 = 1 + 10a Solving 21 = 1 + 10a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-10a' to each side of the equation. 21 + -10a = 1 + 10a + -10a Combine like terms: 10a + -10a = 0 21 + -10a = 1 + 0 21 + -10a = 1 Add '-21' to each side of the equation. 21 + -21 + -10a = 1 + -21 Combine like terms: 21 + -21 = 0 0 + -10a = 1 + -21 -10a = 1 + -21 Combine like terms: 1 + -21 = -20 -10a = -20 Divide each side by '-10'. a = 2 Simplifying a = 2
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