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Simplifying 21 = 7x + 8 Reorder the terms: 21 = 8 + 7x Solving 21 = 8 + 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 = 8 + 7x + -7x Combine like terms: 7x + -7x = 0 21 + -7x = 8 + 0 21 + -7x = 8 Add '-21' to each side of the equation. 21 + -21 + -7x = 8 + -21 Combine like terms: 21 + -21 = 0 0 + -7x = 8 + -21 -7x = 8 + -21 Combine like terms: 8 + -21 = -13 -7x = -13 Divide each side by '-7'. x = 1.857142857 Simplifying x = 1.857142857
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