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Simplifying 99 = 90 + x Solving 99 = 90 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 99 + -1x = 90 + x + -1x Combine like terms: x + -1x = 0 99 + -1x = 90 + 0 99 + -1x = 90 Add '-99' to each side of the equation. 99 + -99 + -1x = 90 + -99 Combine like terms: 99 + -99 = 0 0 + -1x = 90 + -99 -1x = 90 + -99 Combine like terms: 90 + -99 = -9 -1x = -9 Divide each side by '-1'. x = 9 Simplifying x = 9
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