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Simplifying -2x + 7 = 21 Reorder the terms: 7 + -2x = 21 Solving 7 + -2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -2x = 21 + -7 Combine like terms: 7 + -7 = 0 0 + -2x = 21 + -7 -2x = 21 + -7 Combine like terms: 21 + -7 = 14 -2x = 14 Divide each side by '-2'. x = -7 Simplifying x = -7
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