Question

Solve the following linear equations.
n/2-3n/4+5n/6=21

Answer 1

n/2-3n/4+5n/6=21
-n/2+5n/6=21
7n/12=21
n=36

Answer 2

take L.C.M. of denominator which is 24,now make the denominator equal to 24
12n/24-18n/24+20n/24=21
now,(12-18+20)n/24=21
14n=21×24
n=(21×24)/14
n=36