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Simplifying 2x + 21 = 5x + -18 Reorder the terms: 21 + 2x = 5x + -18 Reorder the terms: 21 + 2x = -18 + 5x Solving 21 + 2x = -18 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 21 + 2x + -5x = -18 + 5x + -5x Combine like terms: 2x + -5x = -3x 21 + -3x = -18 + 5x + -5x Combine like terms: 5x + -5x = 0 21 + -3x = -18 + 0 21 + -3x = -18 Add '-21' to each side of the equation. 21 + -21 + -3x = -18 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = -18 + -21 -3x = -18 + -21 Combine like terms: -18 + -21 = -39 -3x = -39 Divide each side by '-3'. x = 13 Simplifying x = 13
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