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Simplifying 3 + x = 21 + 3x Solving 3 + x = 21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 3 + x + -3x = 21 + 3x + -3x Combine like terms: x + -3x = -2x 3 + -2x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 3 + -2x = 21 + 0 3 + -2x = 21 Add '-3' to each side of the equation. 3 + -3 + -2x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + -2x = 21 + -3 -2x = 21 + -3 Combine like terms: 21 + -3 = 18 -2x = 18 Divide each side by '-2'. x = -9 Simplifying x = -9
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