Whenever you use the distributive property, you multiply everything by the thing outside the parenethesis.
For example,
1(3+2)= 1 x 3 + 1 x 2
If the given expression is
17x-32x then
x(17-32) is the equivalent expression.
Since 17 comes first, and both are being multiplied by x, they are equivalent!
I hope this helps!
~kaikers