Question

If 6 x 3y +6 = 89cm2 what is y

Answer 1

18y=89-6=83 cm^2
y=83/18 cm^2

Answer 2

Is that " x " in your expression the letter " x " or are you trying to indicate multiplication?

Answer 3

Convention is that " x " is the letter x, and the multiplication operation is denoted by " * ".