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Simplifying 21 + 4x = 117 + -4x Solving 21 + 4x = 117 + -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 + 4x = 117 + -4x + 4x Combine like terms: 4x + 4x = 8x 21 + 8x = 117 + -4x + 4x Combine like terms: -4x + 4x = 0 21 + 8x = 117 + 0 21 + 8x = 117 Add '-21' to each side of the equation. 21 + -21 + 8x = 117 + -21 Combine like terms: 21 + -21 = 0 0 + 8x = 117 + -21 8x = 117 + -21 Combine like terms: 117 + -21 = 96 8x = 96 Divide each side by '8'. x = 12 Simplifying x = 12
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