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Simplifying 9x + 9(9x + 21) = 9 Reorder the terms: 9x + 9(21 + 9x) = 9 9x + (21 * 9 + 9x * 9) = 9 9x + (189 + 81x) = 9 Reorder the terms: 189 + 9x + 81x = 9 Combine like terms: 9x + 81x = 90x 189 + 90x = 9 Solving 189 + 90x = 9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-189' to each side of the equation. 189 + -189 + 90x = 9 + -189 Combine like terms: 189 + -189 = 0 0 + 90x = 9 + -189 90x = 9 + -189 Combine like terms: 9 + -189 = -180 90x = -180 Divide each side by '90'. x = -2 Simplifying x = -2
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