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3x-5y=-4 (x5)
---------------- -
15x-9y=60
15x-25y=-20
------------------- -
16y=80
y= 80/16
y= 5
5x-3(5)=20
5x - 15 = 20
5x = 20 + 15
5x = 35
x= 35/5
x= 7
6a-2b
6(5) - 2(7)
30 - 14
16