Question

Tìm x biết:

a) 15-(x-7)=-21

b) (17-x)-12=6

Giúp mình nha!

Answer 1

a.15-(x-7)=-21

(x-7)=15-(-21)

(x-7)= 36

x = 36+7

x = 43

b.(17-x)-12=6

(17-x) = 6+12

(17-x) = 18

x = 17-18

x = -1

Answer 2

a) 15-(x-7)= -21

x-7=15- (-21)

x-7=36

x=36+7

x=43

Answer 3

b) (17-x) - 12=6

17-x=6+12

17-x=18

x= 17-18

x=-1

Answer 4

tick cho mk nha