Answers

2015-07-19T10:50:13+08:00
(8x+10x-12+13x-7x+5 )-35x-9x-8
=(18x-12+5x+5)-35x-9x-8
=(18x+5x-12+5)-35x-9x-8
=23x-7-35x-9x-8
=23x-35x-9x-7-8
= -21x-15
(to make it positive, multiply by negative sign)
= -(-21x-15)
=21x+15 is the answer
0