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• Identical expressions

• one - eighty-one /x^ four = zero
• 1 minus 81 divide by x to the power of 4 equally 0
• one minus eighty minus one divide by x to the power of four equally zero
• 1 - 81/x4 = 0
• 1 - 81/x⁴ = 0
• 1 - 81 divide by x^4 = 0

• Similar expressions

• 1 + 81/x^4 = 0