Question 89999
2y^2+5y^2*x7*x3... 
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What does x7 and x3 mean? Is it x^7*x^3
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Assume you mean: {{{2y^2+5y^2*x^7*x^3}}}
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y^2 are like terms so just add them:
{{{7y^2*x^7*x^3}}}
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When you multiply like variables you add the exponents so you have:
{{{7y^2*x^10}}}
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That's about all you can do with it