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y = 3 ( x + 5 ) ( x - 2 )

or this...

3(12-7r^2)(10r-5)

How would I apply the distributive law to these kinds of equations? I've been trying to research this but the only thing I can find is the distributive law in it's simplest form, i.e. a(b+c) = ab + ac. I already understand that. How would I apply it in situations with multiple sets of parentheses being multiplied?