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Simplifying 4x + -21 = 51 Reorder the terms: -21 + 4x = 51 Solving -21 + 4x = 51 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 = 51 + 21 Combine like terms: -21 + 21 = 0 0 + 4x = 51 + 21 4x = 51 + 21 Combine like terms: 51 + 21 = 72 4x = 72 Divide each side by '4'. x = 18 Simplifying x = 18
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