Question 224399
2/3a-3/4=3/4a
2a/3-3/4=3a/4
2a/3-3a/4=3/4
(4*2a-3*3a)/(3*4)=3/4
(8a-9a)/12=3/4
-a/12=3/4
-4a=3*12
-4a=36
a=36/-4
a=-9 ans.
Proof:
2/3*-9-3/4=3/4*-9
-18/3-3/4=-27/4
-6=-27/4+3/4
-6=-24/4
-6=-6