\[2=4-p\]
1
Subtract 44 from both sides.
2−4=−p2-4=-p

2
Simplify  2−42-4  to  −2-2.
−2=−p-2=-p

3
Multiply both sides by −1-1.
2=p2=p

4
Switch sides.
p=2p=2

Done

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