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Simplifying -123 + -7x = 9x + 21 Reorder the terms: -123 + -7x = 21 + 9x Solving -123 + -7x = 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. -123 + -7x + -9x = 21 + 9x + -9x Combine like terms: -7x + -9x = -16x -123 + -16x = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 -123 + -16x = 21 + 0 -123 + -16x = 21 Add '123' to each side of the equation. -123 + 123 + -16x = 21 + 123 Combine like terms: -123 + 123 = 0 0 + -16x = 21 + 123 -16x = 21 + 123 Combine like terms: 21 + 123 = 144 -16x = 144 Divide each side by '-16'. x = -9 Simplifying x = -9
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