Question

Calculate the sum and verify using the commutative law
205+(-187)

Answer 1

$communicative \: law \: = a + b \\ = b + a$
now 205 + (-187) = -187 +205
18. = 18
LHS = RHS verified :)

Answer 2

LHS=205-187=18

RHS= -187+205= 18

RHS=LHS