Question

If a = _8,b = _7c=6, verify that ( a+b ) + c= a+(b+c)

Answer 1

It's so simple dear:-
( a+b ) + c= a+(b+c)
( 8+7 ) + 6= 8+(7+6)
15+6=8+13
21=21
Therefore,
LHS=RHS PROVED

Answer 2

on left hand side of equation
(a+b)+c.
where a=8
b=7
c=6
(8+7)+6
15+6
=21

on right hand side of the equation
a+(b+c)
8+(7+6)
8+13
=21

since both right and left sides of equation are equal, hence verified.