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Simplifying 21x + -4 = 19x + 4 Reorder the terms: -4 + 21x = 19x + 4 Reorder the terms: -4 + 21x = 4 + 19x Solving -4 + 21x = 4 + 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. -4 + 21x + -19x = 4 + 19x + -19x Combine like terms: 21x + -19x = 2x -4 + 2x = 4 + 19x + -19x Combine like terms: 19x + -19x = 0 -4 + 2x = 4 + 0 -4 + 2x = 4 Add '4' to each side of the equation. -4 + 4 + 2x = 4 + 4 Combine like terms: -4 + 4 = 0 0 + 2x = 4 + 4 2x = 4 + 4 Combine like terms: 4 + 4 = 8 2x = 8 Divide each side by '2'. x = 4 Simplifying x = 4
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