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Simplifying 21 + -3 = x Combine like terms: 21 + -3 = 18 18 = x Solving 18 = 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 + -1x = x + -1x Combine like terms: x + -1x = 0 18 + -1x = 0 Add '-18' to each side of the equation. 18 + -18 + -1x = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -1x = 0 + -18 -1x = 0 + -18 Combine like terms: 0 + -18 = -18 -1x = -18 Divide each side by '-1'. x = 18 Simplifying x = 18
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