Question 30483
12a=35+13 or 12a=48 or a=48/12 or a=4

6n~2+7n=20 or 6n~2+7n-20=0 or (2n+5)(3n-4)=0 or 2n+5=0 OR 2N=-5 OR N=-2.5
3N-4=0 OR 3N=4 OR N=4/3 OR 1 1/3.