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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 = 10 -4x = 10 Divide each side by '-4'. x = -2.5 Simplifying x = -2.5
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