Tolong apa jawabannya

2 + a= 6
a = 6 - 2
a = 4

2(a + 1) = 4(c - 1)
2 (4 + 1) = 4c - 4
10 = 4c - 4
4c = 14
c = 14/4
c = 7/2

3(b +a) = b + 6
3 (b + 4) = b + 6
3b + 12 = b + 6
3b - b = 6 - 12
2b = -6
b = -3