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Simplifying 21 = -4a + 7a Combine like terms: -4a + 7a = 3a 21 = 3a Solving 21 = 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 + -3a = 3a + -3a Combine like terms: 3a + -3a = 0 21 + -3a = 0 Add '-21' to each side of the equation. 21 + -21 + -3a = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3a = 0 + -21 -3a = 0 + -21 Combine like terms: 0 + -21 = -21 -3a = -21 Divide each side by '-3'. a = 7 Simplifying a = 7
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