Answer:
a=1.333
Step-by-step explanation:
Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation: 4+6*a-(9*a)=0
Solve : -3a+4 = 0
Subtract 4 from both sides of the equation : -3a = -4
Multiply both sides of the equation by (-1) : 3a = 4
Divide both sides of the equation by 3: a = 4/3 = 1.333
Hope this helps!