- If x can be eliminated from both sides of an equation, the equation is definetly an identity ?

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Why were the first observations of interference patterns so important to the understanding of light? Can someone help me with chemistry, solubility questions? Thank u? Is 60 degrees fahrenheit is warm or cold enough? Determine if 21.76 is a solution to the equation of x over4 =5.44? What was the purpose of adjusting the mobile phase pH to 3.5?