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Simplifying 21 = (7x + 5) Reorder the terms: 21 = (5 + 7x) Remove parenthesis around (5 + 7x) 21 = 5 + 7x Solving 21 = 5 + 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 = 5 + 7x + -7x Combine like terms: 7x + -7x = 0 21 + -7x = 5 + 0 21 + -7x = 5 Add '-21' to each side of the equation. 21 + -21 + -7x = 5 + -21 Combine like terms: 21 + -21 = 0 0 + -7x = 5 + -21 -7x = 5 + -21 Combine like terms: 5 + -21 = -16 -7x = -16 Divide each side by '-7'. x = 2.285714286 Simplifying x = 2.285714286
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