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Simplifying 2x + 7 + -8 = 420 Reorder the terms: 7 + -8 + 2x = 420 Combine like terms: 7 + -8 = -1 -1 + 2x = 420 Solving -1 + 2x = 420 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 2x = 420 + 1 Combine like terms: -1 + 1 = 0 0 + 2x = 420 + 1 2x = 420 + 1 Combine like terms: 420 + 1 = 421 2x = 421 Divide each side by '2'. x = 210.5 Simplifying x = 210.5
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