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Simplifying 1 + 3x = 21 + x Solving 1 + 3x = 21 + 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. 1 + 3x + -1x = 21 + x + -1x Combine like terms: 3x + -1x = 2x 1 + 2x = 21 + x + -1x Combine like terms: x + -1x = 0 1 + 2x = 21 + 0 1 + 2x = 21 Add '-1' to each side of the equation. 1 + -1 + 2x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 2x = 21 + -1 2x = 21 + -1 Combine like terms: 21 + -1 = 20 2x = 20 Divide each side by '2'. x = 10 Simplifying x = 10
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