The idea here is to transfer to the other side everything you don't need.
x = yz
yz = x (switching both sides)
y = x/z (you divide both sides by z, since you want to get rid of the z on the left side).
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yz means to multiply y times z. So you just replace the values, and do the multiplication.
x=2*5 x=10
y=5-x
x = yz/(y - z)
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