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Simplifying 7(5x + 13) = 21 Reorder the terms: 7(13 + 5x) = 21 (13 * 7 + 5x * 7) = 21 (91 + 35x) = 21 Solving 91 + 35x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-91' to each side of the equation. 91 + -91 + 35x = 21 + -91 Combine like terms: 91 + -91 = 0 0 + 35x = 21 + -91 35x = 21 + -91 Combine like terms: 21 + -91 = -70 35x = -70 Divide each side by '35'. x = -2 Simplifying x = -2
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