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Simplifying 21 + -2x + -3 = x Reorder the terms: 21 + -3 + -2x = x Combine like terms: 21 + -3 = 18 18 + -2x = x Solving 18 + -2x = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 18 + -2x + -1x = x + -1x Combine like terms: -2x + -1x = -3x 18 + -3x = x + -1x Combine like terms: x + -1x = 0 18 + -3x = 0 Add '-18' to each side of the equation. 18 + -18 + -3x = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -3x = 0 + -18 -3x = 0 + -18 Combine like terms: 0 + -18 = -18 -3x = -18 Divide each side by '-3'. x = 6 Simplifying x = 6
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