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Simplifying 3a + -21 = 54 + 12a Reorder the terms: -21 + 3a = 54 + 12a Solving -21 + 3a = 54 + 12a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12a' to each side of the equation. -21 + 3a + -12a = 54 + 12a + -12a Combine like terms: 3a + -12a = -9a -21 + -9a = 54 + 12a + -12a Combine like terms: 12a + -12a = 0 -21 + -9a = 54 + 0 -21 + -9a = 54 Add '21' to each side of the equation. -21 + 21 + -9a = 54 + 21 Combine like terms: -21 + 21 = 0 0 + -9a = 54 + 21 -9a = 54 + 21 Combine like terms: 54 + 21 = 75 -9a = 75 Divide each side by '-9'. a = -8.333333333 Simplifying a = -8.333333333
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