i need help writing an equation

On Thursday afternoon Pats stocks fell by 13%. By close her stocks gained 1633.09. She now has 316.84 more. How much did dhe have Thursday morning?
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1 Answer

Let the amount she has on Thursday morning be x.

By thursday afternoon, she has (0.87)x

By close, she has (0.87)x + 1633.09.

Since by close, she has 316.84 more, we will get:

(0.87)x + 1633.09 = x + 316.84
x - (0.87)x = 1633.09 - 316.84
0.13x = 1316.25
x = 1316.25 / 0.13
x = 10125

Hence, she has 10125 shares on Thursday morning.
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