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Simplifying -1 + 4x = -7x + 21 Reorder the terms: -1 + 4x = 21 + -7x Solving -1 + 4x = 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. -1 + 4x + 7x = 21 + -7x + 7x Combine like terms: 4x + 7x = 11x -1 + 11x = 21 + -7x + 7x Combine like terms: -7x + 7x = 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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