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Simplifying A + -2.78 = 4.2 Reorder the terms: -2.78 + A = 4.2 Solving -2.78 + A = 4.2 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '2.78' to each side of the equation. -2.78 + 2.78 + A = 4.2 + 2.78 Combine like terms: -2.78 + 2.78 = 0.00 0.00 + A = 4.2 + 2.78 A = 4.2 + 2.78 Combine like terms: 4.2 + 2.78 = 6.98 A = 6.98 Simplifying A = 6.98
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