a) x^2÷4=9
x^2=4×9=36
x=36÷6=6
b) 25^2-x=24^2
625-x=576
x=625-576
x=49
c)441÷x=21^2
441÷x=441
x=441÷441
x=0
d)x-2^5=5^3
x-32=125
x=125-32
x=93
