4(x - a) + 3b = 5x + a
4x - 4a + 3b = 5x + a
3b - 4a - a = 5x - 4x
x = 3b - 5a
-4a + 3b= 5x + a - 4x
-4a + 3b - a = x
-5a + 3b = x
6.5m questions
8.7m answers