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Simplifying 1 + 7x = -4x + -21 Reorder the terms: 1 + 7x = -21 + -4x Solving 1 + 7x = -21 + -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. 1 + 7x + 4x = -21 + -4x + 4x Combine like terms: 7x + 4x = 11x 1 + 11x = -21 + -4x + 4x Combine like terms: -4x + 4x = 0 1 + 11x = -21 + 0 1 + 11x = -21 Add '-1' to each side of the equation. 1 + -1 + 11x = -21 + -1 Combine like terms: 1 + -1 = 0 0 + 11x = -21 + -1 11x = -21 + -1 Combine like terms: -21 + -1 = -22 11x = -22 Divide each side by '11'. x = -2 Simplifying x = -2
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