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Simplifying 2x + 7x + -90 = 180 Reorder the terms: -90 + 2x + 7x = 180 Combine like terms: 2x + 7x = 9x -90 + 9x = 180 Solving -90 + 9x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '90' to each side of the equation. -90 + 90 + 9x = 180 + 90 Combine like terms: -90 + 90 = 0 0 + 9x = 180 + 90 9x = 180 + 90 Combine like terms: 180 + 90 = 270 9x = 270 Divide each side by '9'. x = 30 Simplifying x = 30
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