Question

Tìm x 

a, -12 . (x-5)+ 7 . ( 3-x ) =15

b, 30(x+20 - 6(x-5) - 24 - x =100

Answer 1

b, 30(x+20) - 6(x-5) - 24 - x =100

30x+600-6x+30-24-x=100

30x-6x+x=100-600-30-24

25x=-554

x=\(-\frac{554}{25}\)

cho li-ke nha

Answer 2

a, -12 . (x-5)+ 7 . ( 3-x ) =15

-12x+60+21-7x=15

-12x7x=15-60-21

-21x=-66

x=  -544/25

tick nha