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Simplifying 7(x + 10) = 21 Reorder the terms: 7(10 + x) = 21 (10 * 7 + x * 7) = 21 (70 + 7x) = 21 Solving 70 + 7x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-70' to each side of the equation. 70 + -70 + 7x = 21 + -70 Combine like terms: 70 + -70 = 0 0 + 7x = 21 + -70 7x = 21 + -70 Combine like terms: 21 + -70 = -49 7x = -49 Divide each side by '7'. x = -7 Simplifying x = -7
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