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Simplifying x + -21 + 3x = -8 + -3x + -13 Reorder the terms: -21 + x + 3x = -8 + -3x + -13 Combine like terms: x + 3x = 4x -21 + 4x = -8 + -3x + -13 Reorder the terms: -21 + 4x = -8 + -13 + -3x Combine like terms: -8 + -13 = -21 -21 + 4x = -21 + -3x Add '21' to each side of the equation. -21 + 21 + 4x = -21 + 21 + -3x Combine like terms: -21 + 21 = 0 0 + 4x = -21 + 21 + -3x 4x = -21 + 21 + -3x Combine like terms: -21 + 21 = 0 4x = 0 + -3x 4x = -3x Solving 4x = -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. 4x + 3x = -3x + 3x Combine like terms: 4x + 3x = 7x 7x = -3x + 3x Combine like terms: -3x + 3x = 0 7x = 0 Divide each side by '7'. x = 0 Simplifying x = 0
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