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Simplifying 90(90 + -1x) = 630 (90 * 90 + -1x * 90) = 630 (8100 + -90x) = 630 Solving 8100 + -90x = 630 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8100' to each side of the equation. 8100 + -8100 + -90x = 630 + -8100 Combine like terms: 8100 + -8100 = 0 0 + -90x = 630 + -8100 -90x = 630 + -8100 Combine like terms: 630 + -8100 = -7470 -90x = -7470 Divide each side by '-90'. x = 83 Simplifying x = 83
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