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Simplifying 21 + -4x = -31 Solving 21 + -4x = -31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -4x = -31 + -21 Combine like terms: 21 + -21 = 0 0 + -4x = -31 + -21 -4x = -31 + -21 Combine like terms: -31 + -21 = -52 -4x = -52 Divide each side by '-4'. x = 13 Simplifying x = 13
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