(X)(x)+(3x)(x)=80

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Solution for (X)(x)+(3x)(x)=80 equation: 



(X)(X)+(3X)(X)=80

We move all terms to the left:

(X)(X)+(3X)(X)-(80)=0

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

XX+3XX=80

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