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• Identical expressions

• three + three /(seven + x) = zero
• 3 plus 3 divide by (7 plus x) equally 0
• three plus three divide by (seven plus x) equally zero
• 3 + 3/7 + x = 0
• 3 + 3 divide by (7 + x) = 0

• Similar expressions

• 3 + 3/(7 - x) = 0
• 3 - 3/(7 + x) = 0