Which equation had no solution?

2.3y +2+3.1y=4.3y+1.6+1.1y+0.4
32x+25-21x=10x
5/8x+2.5=3/8x+1.5+1/4x
1/3+1/7y=3/7y

Aquality characteristic of new iphone x made at the amsterdam plant at apple computers has a manufacturing specification (in mm) of 0.200 +/- .07. historical data indicates that if the quality characteristic takes on values greater than 0.27 or smaller than 0.13 the component fails at a cost of20.19. based on these data: determine the taguchi loss function (must show work) calculate an estimated loss for a quality characteristic of .30 calculate an estimated loss for quality characteristic of .40.