A) 6a + a - 6a = 66Simplify: 6a - 6a = 0Therefore, a = 66
B) 6a - 3a - 2a + 45 = 81Combine like terms: 6a - 3a - 2a = aSubstitute a back into the equation: a + 45 = 81Subtract 45 from both sides: a = 36
Therefore, the solutions are:A) a = 66B) a = 36
A) 6a + a - 6a = 66
Simplify: 6a - 6a = 0
Therefore, a = 66
B) 6a - 3a - 2a + 45 = 81
Combine like terms: 6a - 3a - 2a = a
Substitute a back into the equation: a + 45 = 81
Subtract 45 from both sides: a = 36
Therefore, the solutions are:
A) a = 66
B) a = 36