x2+3x;x=7

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Solution for x2+3x;x=7 equation: 



x2+3xx=7

We move all terms to the left:

x2+3xx-(7)=0

We add all the numbers together, and all the variables

x^2+3xx-7=0

We move all terms containing x to the left, all other terms to the right

x^2+3xx=7

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