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Simplifying 21 = 7x + 6 + -4 Reorder the terms: 21 = 6 + -4 + 7x Combine like terms: 6 + -4 = 2 21 = 2 + 7x Solving 21 = 2 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 21 + -7x = 2 + 7x + -7x Combine like terms: 7x + -7x = 0 21 + -7x = 2 + 0 21 + -7x = 2 Add '-21' to each side of the equation. 21 + -21 + -7x = 2 + -21 Combine like terms: 21 + -21 = 0 0 + -7x = 2 + -21 -7x = 2 + -21 Combine like terms: 2 + -21 = -19 -7x = -19 Divide each side by '-7'. x = 2.714285714 Simplifying x = 2.714285714
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