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Simplifying x + (3x + -5) = -21 Reorder the terms: x + (-5 + 3x) = -21 Remove parenthesis around (-5 + 3x) x + -5 + 3x = -21 Reorder the terms: -5 + x + 3x = -21 Combine like terms: x + 3x = 4x -5 + 4x = -21 Solving -5 + 4x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 4x = -21 + 5 Combine like terms: -5 + 5 = 0 0 + 4x = -21 + 5 4x = -21 + 5 Combine like terms: -21 + 5 = -16 4x = -16 Divide each side by '4'. x = -4 Simplifying x = -4
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