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Simplifying 4x = 21 + -1x Solving 4x = 21 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 4x + x = 21 + -1x + x Combine like terms: 4x + x = 5x 5x = 21 + -1x + x Combine like terms: -1x + x = 0 5x = 21 + 0 5x = 21 Divide each side by '5'. x = 4.2 Simplifying x = 4.2
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