Question 981945
The denominators are x and x+2. They are not the same expression. To combine the fractions, the denominators must be the same. 



The LCD is x(x+2). Multiply the first fraction by (x+2)/(x+2) to get that first denominator equal to the LCD. Multiply the second fraction by x/x to get that second denominator equal to the LCD. 



{{{(3/x)-(3/(x+2))=2}}}



{{{(3(x+2))/(x(x+2))-(3/(x+2))=2}}} Multiply the first fraction by (x+2)/(x+2)



{{{(3(x+2))/(x(x+2))-(3x)/(x(x+2))=2}}} Multiply the second fraction by x/x



{{{(3(x+2)-3x)/(x(x+2))=2}}} Since the fractions have the same denominator, we can finally combine them.



{{{(3x+6-3x)/(x(x+2))=2}}}



{{{(6)/(x(x+2))=2}}}



{{{6=2x(x+2)}}}



{{{6=2x^2+4x}}}



{{{0=2x^2+4x-6}}}



{{{2x^2+4x-6=0}}}



{{{2(x^2+2x-3)=0}}}



{{{x^2+2x-3=0}}}



{{{(x+3)(x-1)=0}}}



{{{x+3=0}}} or {{{x-1=0}}}



{{{x=-3}}} or {{{x=1}}}