(3x+2)(2x+9)-(x+2)(6x+1)=(x+1)-(x-6)
=>6x2+31x+18-6x2-13x-2=x+1-x+6
=>(6x2-6x2)+(31x-13x)+18-2=(x-x)+1+6
=>18x+16=7
=>18x=-9
=>x=-1/2
Đúng 0
Bình luận (0)