How to find out 4 x 754 by using two methods

1. what are the missing reasons in the proof 2. it's in the second picture and 3

Which linear equations have an infinite number of solutions? check all that apply.  (x  –  3/7)  =  2/7(3/2x  –  9/14)8(x  +  2)  =  5x  –  1412.3x  –  18  =  3(–6  +  4.1x)(6x  +  10)  =  7(x  –  2)4.2x  –  3.5  =  2.1 (5x  +  8)

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11