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Simplifying 21a + 21 = 28a + 14 Reorder the terms: 21 + 21a = 28a + 14 Reorder the terms: 21 + 21a = 14 + 28a Solving 21 + 21a = 14 + 28a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-28a' to each side of the equation. 21 + 21a + -28a = 14 + 28a + -28a Combine like terms: 21a + -28a = -7a 21 + -7a = 14 + 28a + -28a Combine like terms: 28a + -28a = 0 21 + -7a = 14 + 0 21 + -7a = 14 Add '-21' to each side of the equation. 21 + -21 + -7a = 14 + -21 Combine like terms: 21 + -21 = 0 0 + -7a = 14 + -21 -7a = 14 + -21 Combine like terms: 14 + -21 = -7 -7a = -7 Divide each side by '-7'. a = 1 Simplifying a = 1
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