Find the value of x.

Step-by-step explanation:

remember the complementary angles,

the angle at the base, near the 78 degrees is 180-78=102, so we have a value for an angle inside the triangle

the acute angle near the 157 is 23 degrees,

we have now the angle near the x equal to

180-(102+23)=55 degrees

x=180-55=125 degrees

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.