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Simplifying -21a + 28 + -6 = -10.2 Reorder the terms: 28 + -6 + -21a = -10.2 Combine like terms: 28 + -6 = 22 22 + -21a = -10.2 Solving 22 + -21a = -10.2 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-22' to each side of the equation. 22 + -22 + -21a = -10.2 + -22 Combine like terms: 22 + -22 = 0 0 + -21a = -10.2 + -22 -21a = -10.2 + -22 Combine like terms: -10.2 + -22 = -32.2 -21a = -32.2 Divide each side by '-21'. a = 1.533333333 Simplifying a = 1.533333333
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