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Simplifying 4 = 4x + -21 Reorder the terms: 4 = -21 + 4x Solving 4 = -21 + 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. 4 + -4x = -21 + 4x + -4x Combine like terms: 4x + -4x = 0 4 + -4x = -21 + 0 4 + -4x = -21 Add '-4' to each side of the equation. 4 + -4 + -4x = -21 + -4 Combine like terms: 4 + -4 = 0 0 + -4x = -21 + -4 -4x = -21 + -4 Combine like terms: -21 + -4 = -25 -4x = -25 Divide each side by '-4'. x = 6.25 Simplifying x = 6.25
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