10a
You can multiply the constants(numbers) if they have the same variable(letters.)
2a-8+4=45-5a 2a-4=45-5a 2a-4+4=45+4-5a 2a+5a=49-5a+5a 7a=49 / by 7 = A=7
Add them together: 2a+5a = 7a
assuming 5a-a-2a-18=0 2a-18=0 2a=18 and thus a=9
2a + 5a + 3a = 10a
2a + 11a - 5a = 8a
2a + 3a = 5a
2a - 5a = -3a
5a- 2a = 3
2a-8+4=45-5a 2a-4=45-5a 2a-4+4=45+4-5a 2a+5a=49-5a+5a 7a=49 / by 7 = A=7
Add them together: 2a+5a = 7a
5a + 3 + (2a - 2) + a= 5a + 3 + 2a - 2 + a= 8a + 1
2a + 10 + 5a - 2 = (2a + 5a) + (10 - 2) = 7a + 8
assuming 5a-a-2a-18=0 2a-18=0 2a=18 and thus a=9
9a +8 -2a -3 -5a = 2a +5
2a + 5a + 3a = 10a
2a+5a+9a = 16a
7a + 10 = 2a 7a = 2a -10 5a = -10 a = -2