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Simplifying 7a + -21 = 3a + 67 Reorder the terms: -21 + 7a = 3a + 67 Reorder the terms: -21 + 7a = 67 + 3a Solving -21 + 7a = 67 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. -21 + 7a + -3a = 67 + 3a + -3a Combine like terms: 7a + -3a = 4a -21 + 4a = 67 + 3a + -3a Combine like terms: 3a + -3a = 0 -21 + 4a = 67 + 0 -21 + 4a = 67 Add '21' to each side of the equation. -21 + 21 + 4a = 67 + 21 Combine like terms: -21 + 21 = 0 0 + 4a = 67 + 21 4a = 67 + 21 Combine like terms: 67 + 21 = 88 4a = 88 Divide each side by '4'. a = 22 Simplifying a = 22
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