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Simplifying 4x + -21 = 2x + 87 Reorder the terms: -21 + 4x = 2x + 87 Reorder the terms: -21 + 4x = 87 + 2x Solving -21 + 4x = 87 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. -21 + 4x + -2x = 87 + 2x + -2x Combine like terms: 4x + -2x = 2x -21 + 2x = 87 + 2x + -2x Combine like terms: 2x + -2x = 0 -21 + 2x = 87 + 0 -21 + 2x = 87 Add '21' to each side of the equation. -21 + 21 + 2x = 87 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 87 + 21 2x = 87 + 21 Combine like terms: 87 + 21 = 108 2x = 108 Divide each side by '2'. x = 54 Simplifying x = 54
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