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Simplifying 7.8a + 12 = 90 Reorder the terms: 12 + 7.8a = 90 Solving 12 + 7.8a = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 7.8a = 90 + -12 Combine like terms: 12 + -12 = 0 0 + 7.8a = 90 + -12 7.8a = 90 + -12 Combine like terms: 90 + -12 = 78 7.8a = 78 Divide each side by '7.8'. a = 10 Simplifying a = 10
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