Find the value of

$(-20)\times (-1)+(-28)÷7$

Find the value of

$(-15)+4÷(5-3)$

Find the value of

$(-40)\times (-1)+(-28)÷7$

Find the value of

$(-3)+(-8)÷(-4)-2\times (-2)$

Find the value of

$(-3)\times (-4)÷(-2)+(-1)$

$3-(5-6÷3)=?$

Simplify the following:

$-25+14÷(5-3)$

Simplify the following:

$25-\frac{1}{2}\{5+4-(3+2-\overline{1+3}\left)\right\}$