c = unknown
a = 4c
120 = 2a + 2c
120 = 2(4c) + 2c
120 = 8c + 2c
120 = 10c
120/10 = 10c/10
c = 12
5x+2x−6=−2x+2
7x−6=−2x+2
7x=−2x+2+6
7x=−2x+8
7x+2x=8
9x=8
x=8/9
Hope this helps, have a blessed day! :-)
