Sagot :
try to isolate the variable
-6=9+4x
subtract 9 from btoh sdies
-9-6=9-9+4x
-15=4x
divide both sdies by 4
-15/4=x
-6=9+4x
subtract 9 from btoh sdies
-9-6=9-9+4x
-15=4x
divide both sdies by 4
-15/4=x