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Simplifying 6 + 3x = 21 + -2x Solving 6 + 3x = 21 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 6 + 3x + 2x = 21 + -2x + 2x Combine like terms: 3x + 2x = 5x 6 + 5x = 21 + -2x + 2x Combine like terms: -2x + 2x = 0 6 + 5x = 21 + 0 6 + 5x = 21 Add '-6' to each side of the equation. 6 + -6 + 5x = 21 + -6 Combine like terms: 6 + -6 = 0 0 + 5x = 21 + -6 5x = 21 + -6 Combine like terms: 21 + -6 = 15 5x = 15 Divide each side by '5'. x = 3 Simplifying x = 3
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