Question

( 13+х) : 7 = (34 + х ) : 9

Answer 1

(1/3+x)÷7=(3/4+x)÷9
1/21+1/7*x=3/36+1/9*x
1/7*x-1/9*x=3/36-1/21
2/63*x=1/28
x=1/28÷2/63
x=63/56
x=1 5/56