Question

solve value for x the equation is x+18=20

Answer 1

x + 18 = 20
⇒ x + 18 - 18 = 20 -18
⇒ x = 2

Answer 2

x+18=20 this is your question

x=20-18 now if you transfer the +18 into r.h.s. then it will become-18 
x=2 and so answer is 2