=>x+25+17+2x=6+x
=>3x+42=6+x
=>3x-x=6-42
=>2x=-36
=>x=-18
x+25+17+2x=6+x
3x-x=6-25-17
2x=-36
x=-36:2=-18
x-(-25-17-2x)=6+x
x+25+17+2x=6+x
x+2x-x=6-25-17
2x=-36
x=(-36) : 2
x=-18
x-(-25-17-2x)=6+x
\(\Leftrightarrow\)x-25+17+2x=6+x
\(\Leftrightarrow\)x+2x-25+17=6+x
\(\Leftrightarrow\)3x-8=6+x
\(\Leftrightarrow\)-x+3x=6+8
\(\Leftrightarrow\)2x=14
\(\Leftrightarrow\)x=7
Vay x=7