Question 723286
Yes.
You can multiply by {{{ 0 }}}, 
but you can't divide by {{{ 0 }}}
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When multiplying, ( - ) x ( - ) = ( + )
( - ) x ( + ) = ( - )
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( - ) / ( - ) = ( + )
( + ) / (- ) = ( -)
( - ) / ( + ) = ( - )
All the rest are pretty simple