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Simplifying 4x + 21 = 149 + -4x Reorder the terms: 21 + 4x = 149 + -4x Solving 21 + 4x = 149 + -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 = 149 + -4x + 4x Combine like terms: 4x + 4x = 8x 21 + 8x = 149 + -4x + 4x Combine like terms: -4x + 4x = 0 21 + 8x = 149 + 0 21 + 8x = 149 Add '-21' to each side of the equation. 21 + -21 + 8x = 149 + -21 Combine like terms: 21 + -21 = 0 0 + 8x = 149 + -21 8x = 149 + -21 Combine like terms: 149 + -21 = 128 8x = 128 Divide each side by '8'. x = 16 Simplifying x = 16
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