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here's a hint:
4x and x + 30 are linear pairs
does that help? or do you need more help?

could use more help im not good with this stuff at all:/

|dw:1350051895685:dw|

do you know what a linear pair is?

nope:/

We call it allied angles In our country

Substitute the corresponding values for a + b = 180 . . :D

Come on have a try.....