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Simplifying 21x + -2 = 18x + 4 Reorder the terms: -2 + 21x = 18x + 4 Reorder the terms: -2 + 21x = 4 + 18x Solving -2 + 21x = 4 + 18x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18x' to each side of the equation. -2 + 21x + -18x = 4 + 18x + -18x Combine like terms: 21x + -18x = 3x -2 + 3x = 4 + 18x + -18x Combine like terms: 18x + -18x = 0 -2 + 3x = 4 + 0 -2 + 3x = 4 Add '2' to each side of the equation. -2 + 2 + 3x = 4 + 2 Combine like terms: -2 + 2 = 0 0 + 3x = 4 + 2 3x = 4 + 2 Combine like terms: 4 + 2 = 6 3x = 6 Divide each side by '3'. x = 2 Simplifying x = 2
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