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Simplifying 21 + -7x = 4x + -123 Reorder the terms: 21 + -7x = -123 + 4x Solving 21 + -7x = -123 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 21 + -7x + -4x = -123 + 4x + -4x Combine like terms: -7x + -4x = -11x 21 + -11x = -123 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + -11x = -123 + 0 21 + -11x = -123 Add '-21' to each side of the equation. 21 + -21 + -11x = -123 + -21 Combine like terms: 21 + -21 = 0 0 + -11x = -123 + -21 -11x = -123 + -21 Combine like terms: -123 + -21 = -144 -11x = -144 Divide each side by '-11'. x = 13.09090909 Simplifying x = 13.09090909
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