I’m studying and I have trouble with this problem and I need an explanation. Please help me! Thank you

Step-by-step explanation:

Im going to assume they want x+108.

You have 2 expressions sitting on a line, so when added to each other they must = 180

So add and set up an equality

x+108+x+78=180

Combine like terms

2x+186=180

Solve

2x+186=180

    -180    -180

2x+6=0

-6       -6

2x=-6

2

x=-3

Substitute X for -3

-3+108=

105.  

Step-by-step explanation:

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