×/7+y/7=(x+y)/7
3a²/15b+12a²/15b=15a²/15b=a²/b
(2b+7a)/16x-(2b+3a)/16x=(4b+10a)/16x=(2b+5a)/8x
2a/(a²-b²)+2b/(a²-b²)=2(a+b)/(a²-b²)=2/(a-b)
m/(m+5)^5+5/(m+5)^5=(m+5)/(m+5)^5=1/(m+5)^4
2y/5a+a^4/2y=(4y²+5a^5)/10ay
(3z-8)/5z²+(z-1)/z²=(8z-13)/5z²
(2a+3b)/21ab+(a+6b)/15ab=(17a+57b)/105ab
2/(a-5)+5/(2a-10)=3/(a-5)