Could someone help me and write out the equation and the solution Thanks will chose brainilest for best answer

x+50=180

x=130

x+45=90

x=45

Step-by-step explanation:

straight angle is 180 degrees

right angle is 90 degrees

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116