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Simplifying x + -21 = 7 + -3x Reorder the terms: -21 + x = 7 + -3x Solving -21 + x = 7 + -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. -21 + x + 3x = 7 + -3x + 3x Combine like terms: x + 3x = 4x -21 + 4x = 7 + -3x + 3x Combine like terms: -3x + 3x = 0 -21 + 4x = 7 + 0 -21 + 4x = 7 Add '21' to each side of the equation. -21 + 21 + 4x = 7 + 21 Combine like terms: -21 + 21 = 0 0 + 4x = 7 + 21 4x = 7 + 21 Combine like terms: 7 + 21 = 28 4x = 28 Divide each side by '4'. x = 7 Simplifying x = 7
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