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Simplifying -21a + 28a + -6 = -10.2 Reorder the terms: -6 + -21a + 28a = -10.2 Combine like terms: -21a + 28a = 7a -6 + 7a = -10.2 Solving -6 + 7a = -10.2 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 7a = -10.2 + 6 Combine like terms: -6 + 6 = 0 0 + 7a = -10.2 + 6 7a = -10.2 + 6 Combine like terms: -10.2 + 6 = -4.2 7a = -4.2 Divide each side by '7'. a = -0.6 Simplifying a = -0.6
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