Answer :
-37
-9(10+x)=243
multiply 10 and x by -9
-90+-9x=243
get rid of -90 by adding 90 to both sides
-9x=333
divide by -9
x=-37
-37
-9(10+x)=243
multiply 10 and x by -9
-90+-9x=243
get rid of -90 by adding 90 to both sides
-9x=333
divide by -9
x=-37