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

If two angles of a triangle have equal measures and the third angle measures 90°, what are the angle measures of the triangle? a. 60°, 60°, 60° b. 45°, 90°, 90° c. 30°, 30°, 90° d. 45°, 45°, 90°