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Simplifying 7x + 6x + 21 = 70 Reorder the terms: 21 + 7x + 6x = 70 Combine like terms: 7x + 6x = 13x 21 + 13x = 70 Solving 21 + 13x = 70 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 13x = 70 + -21 Combine like terms: 21 + -21 = 0 0 + 13x = 70 + -21 13x = 70 + -21 Combine like terms: 70 + -21 = 49 13x = 49 Divide each side by '13'. x = 3.769230769 Simplifying x = 3.769230769
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