Question

28 + (81 - 3.x) : 4 = 40

Answer 1

28+(81-3x):4=40

=>28+(81-3x)=40.4

=>28+(81-3x)=160

=>81-3x=160-28

=>81-3x=132

=>3x=81-132

=>3x=-51

=>x=(-51):3

    =>x=-17

tíc mình nha

Answer 2

28 + (81 - 3.x) : 4 = 40

28 + ( 81 - 3.x ) = 40 . 4

28 + ( 81 - 3.x ) = 160

81 - 3.x = 160 - 28

81 - 3.x = 132

3.x = 81 - 132

3.x = -51

=> x = ( -51 ) : 3

=> x = -17