Question

решения 9y-12*3y+27=0

Answer 1

9у - 12 * 3у + 27 = 0
9у - 36у + 27 = 0
27 = 36у - 9у
27у = 27
у = 27 / 27
у = 1 

Answer 2

9y-36y+27=0
-27y=-27
27y=27
y=27:27
y=1