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Simplifying 18 + 20x = 21 + 19x Solving 18 + 20x = 21 + 19x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-19x' to each side of the equation. 18 + 20x + -19x = 21 + 19x + -19x Combine like terms: 20x + -19x = 1x 18 + 1x = 21 + 19x + -19x Combine like terms: 19x + -19x = 0 18 + 1x = 21 + 0 18 + 1x = 21 Add '-18' to each side of the equation. 18 + -18 + 1x = 21 + -18 Combine like terms: 18 + -18 = 0 0 + 1x = 21 + -18 1x = 21 + -18 Combine like terms: 21 + -18 = 3 1x = 3 Divide each side by '1'. x = 3 Simplifying x = 3
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