Expand and simplify:

$6\left(y+8\right)-5y-3$6(y+8)−5y−3

Simplify: $4x-4\left(7x+6x\right)$4x−4(7x+6x)

Simplify: $6x-7x\times6+8x$6x−7x×6+8x

Expand and simplify the following expressions:

Expand and simplify polynomial expressions involving one variable