first one-
52+76+120+X=360
(52+76)+120+X=360
(128+120)+X=360. make sure to subtract
248+X=360. 248 to both sides
-248. -248. keep it equal man
___________
X=112
2.
4X+18+90+34+12X+6=360. make sure you
16X+148=360. add like signs
16x+148=360. subtract 148
-148. -148. from both sides
__________
16X=212. divide the 16 from both
___. __. sides to cancel the 16
16. 16.
X=13.25. check
3.
84+2Y+5Y+6+2Y+9Y+22 add like terms
18Y+112=360
18Y+112=360 subtract 112 from both
-112. -112. sides
__________
18Y=248. divide both sides by 18
__. __. to cancel the 18
18. 18
Y=13.7777778. check
