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Simplifying 21 = 53 + a Solving 21 = 53 + 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 + -1a = 53 + a + -1a Combine like terms: a + -1a = 0 21 + -1a = 53 + 0 21 + -1a = 53 Add '-21' to each side of the equation. 21 + -21 + -1a = 53 + -21 Combine like terms: 21 + -21 = 0 0 + -1a = 53 + -21 -1a = 53 + -21 Combine like terms: 53 + -21 = 32 -1a = 32 Divide each side by '-1'. a = -32 Simplifying a = -32
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