Question

X*2 +x*3+x*4+x=420

Answer 1

x*2+x*3+x*4+x*1=120
x*(2+3+4+1)=420
x*10=420
x= 420:10
x=42

Answer 2

= X x 2 + X x 3 + X x 4 + X x 1 = 420

= X x ( 2 + 3 + 4 + 1 ) = 420

= X x 10 = 420 

= 420 : 10

= 42