math.. solve solve solve.. pleease?

0.35x - 1.2 = 0.2
0.35x = 0.2 + 1.2
0.35x = 1.4 . . . . . <- divide both sides by 0.35
x = 4

Done

The first one is very difficult to read I suggest retyping it with more brackets. The second (so long as it is (1/3)^(-1/3). Isn't too hard. This represents (((1/3)^-1))^(1/3)) which you can show if you remember your rules of surds. So, (1/3)^-1 is 3 and then you're just left with 3^(1/3) which is the cubed root of 3.

Lee Holmes deposited $15,000 in a new savings account at 9% interest compounded semiannually. At the beginning of year 4, Lee deposits an additional $40,000 at 9% interest compounded semiannually.

At the end of 6 years, what is the balance in Lee’s account?

0.35x - 1.2 = 0.2
0.35x = 0.2 + 1.2
0.35x = 1.4
x = 1.4/0.35
x = 4

X=4

0.35x - 1.2 = 0.2
0.35x = 0.2 + 1.2
0.35x = 1.4
x = 1.4 / 0.35 (divide)
x = 4

0.35x = 0.2 + 1.2
0.35x = 1.4
x= 4

x=4

0.35= 0.2 + 1.2
0.35x = 1.4
x = 1.4/0.35
x = 4

0.35x=1.4
x=4