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Simplifying 21x + 4 = 25x + -20 Reorder the terms: 4 + 21x = 25x + -20 Reorder the terms: 4 + 21x = -20 + 25x Solving 4 + 21x = -20 + 25x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-25x' to each side of the equation. 4 + 21x + -25x = -20 + 25x + -25x Combine like terms: 21x + -25x = -4x 4 + -4x = -20 + 25x + -25x Combine like terms: 25x + -25x = 0 4 + -4x = -20 + 0 4 + -4x = -20 Add '-4' to each side of the equation. 4 + -4 + -4x = -20 + -4 Combine like terms: 4 + -4 = 0 0 + -4x = -20 + -4 -4x = -20 + -4 Combine like terms: -20 + -4 = -24 -4x = -24 Divide each side by '-4'. x = 6 Simplifying x = 6
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