2x + 7 = 19
2x = 19 - 7 ( because in LHS if ther is plus
then in RHS it will be minus )
2x = 12 ( because 19 - 7 is equals to 7 )
x = 12 /2 ( because in LHS if there is
multiplication then in RHS it will
be division )
x = 6 ( because 12 / 2 is equals to 6 )
So the ans is 6