r^2 + 4 = 4
-5-3
1,3,7,15
25+10%=
1,1,2,6,24
6--2
a+2b+3c=0
2a+3b+c=0
4a+5b+4c=0
a+2b-2c=0
1,2,4,8,16
simplify =\frac{\left(x^2-36\right)\left(x^2-9\right)}{\left(x^2+x-12\right)\left(x^2-4x-12\right)}
1,3,6,10,15