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Simplifying 2.25a + -7.5 = 21 Reorder the terms: -7.5 + 2.25a = 21 Solving -7.5 + 2.25a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + 2.25a = 21 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + 2.25a = 21 + 7.5 2.25a = 21 + 7.5 Combine like terms: 21 + 7.5 = 28.5 2.25a = 28.5 Divide each side by '2.25'. a = 12.66666667 Simplifying a = 12.66666667
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