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10a-6-a-12ai2=0|+6
9a-12ai2=6
c) 2/5(x-5y)=90-5(3y-2)
2/5x-2y=90-15y+10|+15y
2/5x+13y=100|*5
2x+65y=500
10a-6-a-12a+8=0
10a-a-12a=0-8+6
-3a=-2/(-3)
a=2/3
2/5(x-5y)=90-5(3y-2)
2/5x-2y=90-15y+10
2/5x-2y+15y=90+10
2/5x-13y=100