HELP WILL MARK BRAINLIEST

Answer:
x = [tex]\frac{4}{21}[/tex]
Step-by-step explanation:
Well first you have to isolate x so divide by 3/4 on both sides. when you divide a fraction by another fraction you multiply by the reciprical.(I think i spelled reciprical wrong, tell me if i did) Therefore you must multiply
1/7 by 4/3 giving you 4/21 which is equal to x.