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Simplifying 3x + 18 = 6x + 21 Reorder the terms: 18 + 3x = 6x + 21 Reorder the terms: 18 + 3x = 21 + 6x Solving 18 + 3x = 21 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. 18 + 3x + -6x = 21 + 6x + -6x Combine like terms: 3x + -6x = -3x 18 + -3x = 21 + 6x + -6x Combine like terms: 6x + -6x = 0 18 + -3x = 21 + 0 18 + -3x = 21 Add '-18' to each side of the equation. 18 + -18 + -3x = 21 + -18 Combine like terms: 18 + -18 = 0 0 + -3x = 21 + -18 -3x = 21 + -18 Combine like terms: 21 + -18 = 3 -3x = 3 Divide each side by '-3'. x = -1 Simplifying x = -1
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