Geetha has $12$ toffees with her in the morning. She gave $3$ to her brother and by afternoon her uncle gave her $5$ more and then she gave $4$ more to her brother. By evening, she received $6$ toffees from her grandfather and again gave $7$ more toffees to her brother. Find the number of toffees left with her by the end of the day, if she eats $3$ of them. 

Simplify the following:

$1.\left(-4\right)\times 81÷9\times \left(-5\right)$

Simplify the following:

$2. 15+39÷\left(-13\right)\times 8-100$

Simplify the following:

$3. 60÷15\times 18-\left[\left(-9\right)+\left\{-14-6 \text{of} 4+6-\overline{9+11}\right\}\right]$

Simplify the following:

$4. \left(54+90\right)÷\left(-16\right)+100-\left\{7 \text{of} \left(-20\right)-45-16-32\right\}$

Simplify the following:

$5 . 175-\left\{34+16 \text{of} \left(-4\right)\right\}+9-\left(17+\overline{91-6+51}\right)$

Simplify the following:

$6 . 5-4\left[3-\left(-4\right)+\left\{\left(-9\right)-12-\overline{20+10}\right\}\right]$

Simplify the following:

$7. \left(-48\right)÷16-\left(-10\right)\left[12-3+\left(10-21\right)\right]$

Simplify the following:

$8 . 52-4 \text{of} \left(17-12\right)+4\times 6$