Oh, dude, that's like basic math 101. So, if you have 2a plus 5a, you just add the coefficients together, which gives you 7a. It's like combining apples and Oranges, but in this case, it's just adding up those 'a's. Easy peasy, lemon squeezy.
7a
5a + 3 + (2a - 2) + a= 5a + 3 + 2a - 2 + a= 8a + 1
2a + 5a + 3a = 10a
2a+5a+9a = 16a
2a + 10 + 5a - 2 = (2a + 5a) + (10 - 2) = 7a + 8
Add them together: 2a+5a = 7a
9a +8 -2a -3 -5a = 2a +5
2a + 3a = 5a
The value of a in the equation 5a plus 2a = 6-6a is a=6/11.
2a + 11a - 5a = 8a
3a + 2a = 5a
-7a+2a+9 is also -5a+9. -5a+9=24. -5a=15. a=-3.