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Simplifying -21 = (x + -8) + 3x Reorder the terms: -21 = (-8 + x) + 3x Remove parenthesis around (-8 + x) -21 = -8 + x + 3x Combine like terms: x + 3x = 4x -21 = -8 + 4x Solving -21 = -8 + 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 = -8 + 4x + -4x Combine like terms: 4x + -4x = 0 -21 + -4x = -8 + 0 -21 + -4x = -8 Add '21' to each side of the equation. -21 + 21 + -4x = -8 + 21 Combine like terms: -21 + 21 = 0 0 + -4x = -8 + 21 -4x = -8 + 21 Combine like terms: -8 + 21 = 13 -4x = 13 Divide each side by '-4'. x = -3.25 Simplifying x = -3.25
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