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Simplifying -87 + -9x = 9x + 21 Reorder the terms: -87 + -9x = 21 + 9x Solving -87 + -9x = 21 + 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. -87 + -9x + -9x = 21 + 9x + -9x Combine like terms: -9x + -9x = -18x -87 + -18x = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 -87 + -18x = 21 + 0 -87 + -18x = 21 Add '87' to each side of the equation. -87 + 87 + -18x = 21 + 87 Combine like terms: -87 + 87 = 0 0 + -18x = 21 + 87 -18x = 21 + 87 Combine like terms: 21 + 87 = 108 -18x = 108 Divide each side by '-18'. x = -6 Simplifying x = -6
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