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Simplifying 2x + 21 = 7 * -7 Reorder the terms: 21 + 2x = 7 * -7 Multiply 7 * -7 21 + 2x = -49 Solving 21 + 2x = -49 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 + 2x = -49 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = -49 + -21 2x = -49 + -21 Combine like terms: -49 + -21 = -70 2x = -70 Divide each side by '2'. x = -35 Simplifying x = -35
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