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Simplifying -90 + -2x = 99 + -9x Solving -90 + -2x = 99 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. -90 + -2x + 9x = 99 + -9x + 9x Combine like terms: -2x + 9x = 7x -90 + 7x = 99 + -9x + 9x Combine like terms: -9x + 9x = 0 -90 + 7x = 99 + 0 -90 + 7x = 99 Add '90' to each side of the equation. -90 + 90 + 7x = 99 + 90 Combine like terms: -90 + 90 = 0 0 + 7x = 99 + 90 7x = 99 + 90 Combine like terms: 99 + 90 = 189 7x = 189 Divide each side by '7'. x = 27 Simplifying x = 27
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