Answer:
Step-by-step explanation:
Ok so supplementary angles add up to 180°. If A and B add up to 180, then they can be added together to be solved. x+2x-30=180 would be your equation. From here you must balance the variable values on one side and numerical values on the other side. This can simply be done by adding 30 to both sides. Not the -30 is gone but 180 increased by 30 degrees to 210. next, combine like terms on the x side to get 3x. (2x+x=3x). set 3x equal to 210 and divide both sides to lose the 3 in front of the x value. 210/3 is equal to 70, making x=70! This may be hard to follow, so comment below if you need a broader explanation. Have good day!
