Which linear equations have an infinite number of solutions? Check all that apply.
1. (x-3/7) = 2/3(3/2x-9/14)
2. 8(x+2) = 5x-14
3. 12.3x-18 = 3(-6+4.1x)
4. 1/2(6x+10) = 7(3/7-2)
5. 4.2x-3.5 = 2.1(5x+8)