X+y=130

4*x = (x+y-x) / 3

Solve by using substitution, x=130-y

plug x into the second equation 4 * (130-y) = y/3

(The first part of the equation (x+y-x) is equivalent to just Y)

distribute the 4 520-4y=y/3

multiply both sides by 3 to isolate the variable

add 12y to both sides 1,560-12y=y

1,560=13y Divide both sides by 13

y=120

Plug y back into the first equation x=130-120

x=10