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Simplifying -21 = -1 + -4x Solving -21 = -1 + -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 = -1 + -4x + 4x Combine like terms: -4x + 4x = 0 -21 + 4x = -1 + 0 -21 + 4x = -1 Add '21' to each side of the equation. -21 + 21 + 4x = -1 + 21 Combine like terms: -21 + 21 = 0 0 + 4x = -1 + 21 4x = -1 + 21 Combine like terms: -1 + 21 = 20 4x = 20 Divide each side by '4'. x = 5 Simplifying x = 5
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