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7•?=x

x+20=p

p+x=180

80/7 or 11.429

Step-by-Step explanation:

so first we define x in terms of p (or p in terms of x)

x=180-p

replace x in the equation x+20=p with 180-p

180-p+20=p

add p to each side

200=2p

p=100

so now we can find x

180-p=x

180-100=x

x=80

say z=?

7=80/z

multiply both sides by z

7z=80

divide both sides by 7

z=80/7

?=11 3/7

40 is the final : )

555.99.

step-by-step explanation:

hope this