Question

cat fac {[(107 - 63 : X ) x 9 - 2] : 5 + 3 x 9 } x 4 - 12 = 800

Answer 1

{[(107-63:x)*9-2]:5+27}*4-12=800

{[(107-63:x)*9-2]:5+27}*4=800+12

{[(107-63:x)*9-2]:5+27}*4=812

[(107-63:x)*9-2]:5+27=812:4

[(107-63:x)*9-2]:5+27=203

[(107-63:x)*9-2]:5=203-27

[(107-63:x)*9-2]:5=176

(107-63:x)*9-2=176*5

(107-63:x)*9-2=880

(107-63:x)*9=882

107-63:x=882:9

107-63:x=98

63:x=107-98

63:x=9

x=63:9

x=7