Answer:
x = 21
Step-by-step explanation:
It's easier, tho' not essential, to re-write this equation as
7 x
---- = ------
9 27
To cross-multiply: draw an imaginary line diagonally through 9 and x. Multiplying, we get 9x. Do the same with the other diagonal, through 7 and 27: we get 7(27) = 189.
Then we have a new equation without fractions: 9x = 189.
Solve for x. To do this, divide both sides by 9, obtaining:
x = 21
