math
posted by barb on .
5(3+4x)6>=129
I get 2 different answers on this one.
15+20x6>=129
15+20x6+6>=129+6
15+20x>=135
1515+20x>=13515
20x>=120
20x/20>=120/20
x>=6
Is this worked out properly, are there any shortcuts?

5(3+4x)6>=129
15+20x6>=129
9+20x>=129
20x>=120
x>=6