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90+2x+100+5x+55=180

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Q: What is the first statement in any two-column proof for math?
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What is a proof in math?

"In mathematics, a proof is a demonstration that if some fundamental statements (axioms) are assumed to be true, then some mathematical statement is necessarily true." (from Wikipedia)


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What is the name of the branch of math that has to do with reasoning and proof?

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