7x=7x-5
\(7x=7x-5\)
\(7x-7x=7x-5-7x\)
\(0x=7x-5-7x\)
\(0=7x-5-7x\)
\(0=0x-5\)
\(0=0-5\)
\(0=-5\)
\(Ø\)