Help with math question please

Paulo bought 2 shirts and used a coupon that was fifteen dollars off any purchase. If his total purchase was forty-three dollars, which equation could be used to determine the price of each shirt?

First we need to define the variable:

x = # of shirts

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We have two of x, so:

2x

And the coupon takes off $15 of any purchase, so:

2x-15

And it has to be an equations that equals $43, so:

2x-15=43
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Then check:

2x-15=43
+15 =+15

2x=58
/2 = /2

x= 29
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2x-15=43
2(29)-15=43
58-15=43
43=43

Therefore the correct equation is 2x-15=43

Let the priice of one shirt be S
Paulo bought two shirts, so that's 2S
He used a $15 off coupon, so that's -15
It totalled $43, so that's = 43

Put it all together:
2S - 15 = 43

Now, to solve:
Add 15 to both sides of the equation:
2S - 15 + 15 = 43 + 15
2S + 0 = 58
2S = 58
Divide both sides of the equation by 2
2S/2 = 58/2
S = 29

Each shirt cost $29