3(X-1)-2.(X+5)-(7+X)
=3X-3-2X-10-7-X
=-10
\(3\left(x-1\right)-2\left(x+5\right)-\left(7+x\right)\)
\(=3x-3-2x-10-7-x\)
\(=\)\(\left(3x-2x-x\right)-\left(3+7+10\right)\)
\(=0x-20\)
\(=-20\)
3(x - 1) - 2(x + 5) - (7 + x)
= 3x - 3 - 2(x + 5) - (7 + x)
= 3x - 3 - 2x - 10 - 7 - x
= 3x - 2x - x - 3 - 10 - 7
= -3 - 10 - 7
= 20