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Simplifying 4x + 8 = x + -3x + 21 Reorder the terms: 8 + 4x = x + -3x + 21 Reorder the terms: 8 + 4x = 21 + x + -3x Combine like terms: x + -3x = -2x 8 + 4x = 21 + -2x Solving 8 + 4x = 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. 8 + 4x + 2x = 21 + -2x + 2x Combine like terms: 4x + 2x = 6x 8 + 6x = 21 + -2x + 2x Combine like terms: -2x + 2x = 0 8 + 6x = 21 + 0 8 + 6x = 21 Add '-8' to each side of the equation. 8 + -8 + 6x = 21 + -8 Combine like terms: 8 + -8 = 0 0 + 6x = 21 + -8 6x = 21 + -8 Combine like terms: 21 + -8 = 13 6x = 13 Divide each side by '6'. x = 2.166666667 Simplifying x = 2.166666667
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