Answer:
x=26
Step-by-step explanation:
You have already set up an equation for us.
75+105=180
This is because a line is 180 degrees.
This said, we can set up an equation to find x.
4x+1=105
Isolate x by first subtracting 1 from both sides.
4x=104
Divide both sides by 4.
x=26
