Question

tìm x
5)7(x-9)-5(6-x)=-6+11x
6)5(3-2x)+5(x-4)=6-4x
7)-7(3x-5)+2(7x-14)=28
9)5(4-x)-7(-x+2)=4-9+3
10)-3(x-5)+6(x+2)=9

cần gấp hứa k

Answer 1

5: \(\Leftrightarrow7x-63-30+5x=11x-6\)

=>12x-93=11x-6

=>x=87

6: \(\Leftrightarrow15-10x+5x-20=6-4x\)

=>-5x-5=6-4x

=>-x=11

=>x=-11

7: \(\Leftrightarrow-21x+35+14x-28=28\)

=>-7x+7=28

=>x=-3

9: =>20-5x+7x-14=-2

=>2x+6=-2

=>2x=-8

=>x=-4