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Simplifying 4x + -21 = 7x + 21 Reorder the terms: -21 + 4x = 7x + 21 Reorder the terms: -21 + 4x = 21 + 7x Solving -21 + 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. -21 + 4x + -7x = 21 + 7x + -7x Combine like terms: 4x + -7x = -3x -21 + -3x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 -21 + -3x = 21 + 0 -21 + -3x = 21 Add '21' to each side of the equation. -21 + 21 + -3x = 21 + 21 Combine like terms: -21 + 21 = 0 0 + -3x = 21 + 21 -3x = 21 + 21 Combine like terms: 21 + 21 = 42 -3x = 42 Divide each side by '-3'. x = -14 Simplifying x = -14
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