Answer:
f(x)=(12-3x)/2
Step-by-step explanation:
1) add -3x to both sides
2) divide them by 2
1200 es la respuesta total
-9x=-36
divide both sides by -9
to get x by itself
to get +x
-9x/-9= -36/-9
cross out -9 and -9, then becomes -1*-1*x= x
x= -36/-9
answer:
x= 4