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Simplifying 4x + -4 = 21 + x Reorder the terms: -4 + 4x = 21 + x Solving -4 + 4x = 21 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -4 + 4x + -1x = 21 + x + -1x Combine like terms: 4x + -1x = 3x -4 + 3x = 21 + x + -1x Combine like terms: x + -1x = 0 -4 + 3x = 21 + 0 -4 + 3x = 21 Add '4' to each side of the equation. -4 + 4 + 3x = 21 + 4 Combine like terms: -4 + 4 = 0 0 + 3x = 21 + 4 3x = 21 + 4 Combine like terms: 21 + 4 = 25 3x = 25 Divide each side by '3'. x = 8.333333333 Simplifying x = 8.333333333
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