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if the x in "7x2" is variable x, then
7x(2)-5x=0
14x-5x=0
9x=0
x=0
if the x in "7x2" is a symbol for multiplication, then
7(2)-5x=0
14-5x=0
-5x= -14
5x=14
x= 14/5
x= 2 4/5
or, to factor it out...
x(14-5)=0
x(9)=0