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Simplifying 2x + -1 = 7x + -21 Reorder the terms: -1 + 2x = 7x + -21 Reorder the terms: -1 + 2x = -21 + 7x Solving -1 + 2x = -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 + 2x + -7x = -21 + 7x + -7x Combine like terms: 2x + -7x = -5x -1 + -5x = -21 + 7x + -7x Combine like terms: 7x + -7x = 0 -1 + -5x = -21 + 0 -1 + -5x = -21 Add '1' to each side of the equation. -1 + 1 + -5x = -21 + 1 Combine like terms: -1 + 1 = 0 0 + -5x = -21 + 1 -5x = -21 + 1 Combine like terms: -21 + 1 = -20 -5x = -20 Divide each side by '-5'. x = 4 Simplifying x = 4
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