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Simplifying -4a + 5 + -7a = 21 Reorder the terms: 5 + -4a + -7a = 21 Combine like terms: -4a + -7a = -11a 5 + -11a = 21 Solving 5 + -11a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -11a = 21 + -5 Combine like terms: 5 + -5 = 0 0 + -11a = 21 + -5 -11a = 21 + -5 Combine like terms: 21 + -5 = 16 -11a = 16 Divide each side by '-11'. a = -1.454545455 Simplifying a = -1.454545455
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