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Simplifying -121 + -9x = 7x + 21 Reorder the terms: -121 + -9x = 21 + 7x Solving -121 + -9x = 21 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. -121 + -9x + -7x = 21 + 7x + -7x Combine like terms: -9x + -7x = -16x -121 + -16x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 -121 + -16x = 21 + 0 -121 + -16x = 21 Add '121' to each side of the equation. -121 + 121 + -16x = 21 + 121 Combine like terms: -121 + 121 = 0 0 + -16x = 21 + 121 -16x = 21 + 121 Combine like terms: 21 + 121 = 142 -16x = 142 Divide each side by '-16'. x = -8.875 Simplifying x = -8.875
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