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Simplifying 56 + 7a = 21a Solving 56 + 7a = 21a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21a' to each side of the equation. 56 + 7a + -21a = 21a + -21a Combine like terms: 7a + -21a = -14a 56 + -14a = 21a + -21a Combine like terms: 21a + -21a = 0 56 + -14a = 0 Add '-56' to each side of the equation. 56 + -56 + -14a = 0 + -56 Combine like terms: 56 + -56 = 0 0 + -14a = 0 + -56 -14a = 0 + -56 Combine like terms: 0 + -56 = -56 -14a = -56 Divide each side by '-14'. a = 4 Simplifying a = 4
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