For number 1, you solve it like an equation.
My teacher always says this," Undo what has been done."
It means to do the opposite done to the variable.
3/8x>9
3/8 is being multiplied to the variable so if you do the opposite, you divide 3/8 to each side.
x>24
Number 2
21g>105
You divide each side by 21
g>5