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Simplifying -21 = 3x + x + 7 Reorder the terms: -21 = 7 + 3x + x Combine like terms: 3x + x = 4x -21 = 7 + 4x Solving -21 = 7 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -21 + -4x = 7 + 4x + -4x Combine like terms: 4x + -4x = 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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