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Simplifying -1 + 21x = 19x + 7 Reorder the terms: -1 + 21x = 7 + 19x Solving -1 + 21x = 7 + 19x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-19x' to each side of the equation. -1 + 21x + -19x = 7 + 19x + -19x Combine like terms: 21x + -19x = 2x -1 + 2x = 7 + 19x + -19x Combine like terms: 19x + -19x = 0 -1 + 2x = 7 + 0 -1 + 2x = 7 Add '1' to each side of the equation. -1 + 1 + 2x = 7 + 1 Combine like terms: -1 + 1 = 0 0 + 2x = 7 + 1 2x = 7 + 1 Combine like terms: 7 + 1 = 8 2x = 8 Divide each side by '2'. x = 4 Simplifying x = 4
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