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Simplifying -21 = x + 7 + -3x Reorder the terms: -21 = 7 + x + -3x Combine like terms: x + -3x = -2x -21 = 7 + -2x Solving -21 = 7 + -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. -21 + 2x = 7 + -2x + 2x Combine like terms: -2x + 2x = 0 -21 + 2x = 7 + 0 -21 + 2x = 7 Add '21' to each side of the equation. -21 + 21 + 2x = 7 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 7 + 21 2x = 7 + 21 Combine like terms: 7 + 21 = 28 2x = 28 Divide each side by '2'. x = 14 Simplifying x = 14
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