Question

(x.30)+1335=31.x

Answer 1

`30x + 1335 = 31x`

`<=> 1335 =x`

Vậy `x = 1335`

Answer 2

\(\left(x.30\right)+1335=31.x\)

\(31.x-30.x=1335\)

\(x=1335\)

Answer 3

\(\left(x.30\right)+1335=31x\\ \Leftrightarrow30x-31x=1335\\ \Leftrightarrow-x=1335\\ \Rightarrow x=-1335\)