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Simplifying 21x + -56 = x + 4 Reorder the terms: -56 + 21x = x + 4 Reorder the terms: -56 + 21x = 4 + x Solving -56 + 21x = 4 + 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. -56 + 21x + -1x = 4 + x + -1x Combine like terms: 21x + -1x = 20x -56 + 20x = 4 + x + -1x Combine like terms: x + -1x = 0 -56 + 20x = 4 + 0 -56 + 20x = 4 Add '56' to each side of the equation. -56 + 56 + 20x = 4 + 56 Combine like terms: -56 + 56 = 0 0 + 20x = 4 + 56 20x = 4 + 56 Combine like terms: 4 + 56 = 60 20x = 60 Divide each side by '20'. x = 3 Simplifying x = 3
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