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Simplifying 3x + 4 = 21x Reorder the terms: 4 + 3x = 21x Solving 4 + 3x = 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 + 3x + -21x = 21x + -21x Combine like terms: 3x + -21x = -18x 4 + -18x = 21x + -21x Combine like terms: 21x + -21x = 0 4 + -18x = 0 Add '-4' to each side of the equation. 4 + -4 + -18x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -18x = 0 + -4 -18x = 0 + -4 Combine like terms: 0 + -4 = -4 -18x = -4 Divide each side by '-18'. x = 0.2222222222 Simplifying x = 0.2222222222
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