Jawabanmu

2014-05-06T12:14:14+07:00
2(x + x - 5) < 90
2x + 2x - 10 < 90
4x - 10 < 90
4x < 100
x < 25
2014-05-06T12:15:27+07:00
( x . 2 ) + ( x-5 . 2 ) < 90
2x + 2x  - 10 < 90
4x < 100
x < 25