Question

tìm x: [(6x-39):7].4=12

Answer 1

\(\left[\left(6x-39\right):7\right].4=12\)

\(=>\left(6x-39\right):7=12:4\)

\(=>\left(6x-39\right):7=3\)

\(=>6x-39=3.7\)

\(=>6x-39=21\)

\(=>6x=21+39\)

\(=>6x=60\)

\(=>x=60:6\)

\(=>x=10\)

Answer 2

[(6x - 39) : 7] . 4 = 12

(6x - 39) : 7 = 12 : 4

(6x - 39) : 7 = 3

6x - 39 = 3 . 7

6x - 39 = 21

6x = 21 + 39

6x = 60

x = 60 : 6

x = 10