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Simplifying 21x + -7 = x + 13 Reorder the terms: -7 + 21x = x + 13 Reorder the terms: -7 + 21x = 13 + x Solving -7 + 21x = 13 + 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. -7 + 21x + -1x = 13 + x + -1x Combine like terms: 21x + -1x = 20x -7 + 20x = 13 + x + -1x Combine like terms: x + -1x = 0 -7 + 20x = 13 + 0 -7 + 20x = 13 Add '7' to each side of the equation. -7 + 7 + 20x = 13 + 7 Combine like terms: -7 + 7 = 0 0 + 20x = 13 + 7 20x = 13 + 7 Combine like terms: 13 + 7 = 20 20x = 20 Divide each side by '20'. x = 1 Simplifying x = 1
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