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Simplifying -21 = 5 + 4x Solving -21 = 5 + 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 = 5 + 4x + -4x Combine like terms: 4x + -4x = 0 -21 + -4x = 5 + 0 -21 + -4x = 5 Add '21' to each side of the equation. -21 + 21 + -4x = 5 + 21 Combine like terms: -21 + 21 = 0 0 + -4x = 5 + 21 -4x = 5 + 21 Combine like terms: 5 + 21 = 26 -4x = 26 Divide each side by '-4'. x = -6.5 Simplifying x = -6.5
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