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