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( ) / ( +3)= -10
x/3= -10
x=3(-10)
x=-30
( )/ (4/7)= - 5/3
x/(4/7)=-5/3
x=(4/7)(-5/3)
x=4(-5)/7(3)
x=-20/21
( -7))/ ( )= -7
-7/x=-7
-7=-7x
x=-7/-7
x=1