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Simplifying 3 + 7x = 21 + x Solving 3 + 7x = 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. 3 + 7x + -1x = 21 + x + -1x Combine like terms: 7x + -1x = 6x 3 + 6x = 21 + x + -1x Combine like terms: x + -1x = 0 3 + 6x = 21 + 0 3 + 6x = 21 Add '-3' to each side of the equation. 3 + -3 + 6x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 6x = 21 + -3 6x = 21 + -3 Combine like terms: 21 + -3 = 18 6x = 18 Divide each side by '6'. x = 3 Simplifying x = 3
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