Question

tìm số nguyên x, biết :3.x+21=-6

Answer 1

\(3.x+21=-6\)
\(3.x=-27\)
\(x=-9\)

Answer 2

\(3.x+21=-6\\ 3.x=-6-21\\ 3.x=-27\\ x=-27:3\\ x=-9\)

Answer 3

\(\text{3. x + 21 = − 6}\)

\(\text{3. x = −6 − 21}\)

\(\text{3.x = −27}\)

\(\text{x = −27 : 3}\)

\(\text{x = −9}\)