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Simplifying 2x + x + 7 = 520 Reorder the terms: 7 + 2x + x = 520 Combine like terms: 2x + x = 3x 7 + 3x = 520 Solving 7 + 3x = 520 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 + 3x = 520 + -7 Combine like terms: 7 + -7 = 0 0 + 3x = 520 + -7 3x = 520 + -7 Combine like terms: 520 + -7 = 513 3x = 513 Divide each side by '3'. x = 171 Simplifying x = 171
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