10 - 3(x - 1) = -5
<=> 10 - 3x + 3 = -5
<=> 13 - 3x = -5
<=> -3x = -5 - 13 = -18
<=> x = 6
Vậy ................
10-3(x-1)=-5
<=> 10-3x+3=-5
<=> -3x+13=-5
<=> -3x=-18
<=> x=6
\(10-3\left(x-1\right)=-5\)
\(\Leftrightarrow\)\(10-3x+3=-5\)
\(\Leftrightarrow\)\(-3x=-5-3-10\)
\(\Leftrightarrow\)\(-3x=-18\)
\(\Leftrightarrow\)\(x=6\)
Hok tốt !