{{
8a=5b+9 3x= y+16
7x-4y=37 5m+9b=7 {{
2y+2x=37 -10m-4b=10
5a=3b+20 3x-9y=0 {{
5a=4b+7 7x-5y=1
8x+9y=40 0.7x-0.5y=2.6 {{
2y+2x=40 0.7x+0.6y=3.6
{{
a=6b-20 2x=3y+17
7x-7y=134 3m+5b=25 {{
2y+8x=134 -7m- b=4
2a= b-20 4x+8y=8
{{
7a=2b+18 8x- y=-9
9x+5y=117 0.3x+0.2y=2.9 {{
3y+6x=117 0.8x-0.7y=2.3
{{
a=9b+17 6x=5y+17
8x-4y=30 6m+3b=29
{{
8y-3x=30 -9m-6b=1
6a=3b+6 5x-5y=-10 {{
6a=4b-11 7x+3y=7
5x+2y=179 0.5x-0.2y=1.2 {{
8y-7x=179 0.5x+0.6y=4
{{
9a= b+1 6x= y+9
4x-8y=84 2m-4b=7 {{
3y+3x=84 -6m+ b=17
6a=6b-15 5x-7y=-7 {{
a=2b-3 2x-5y=-4
8x+7y=19 0.3x-0.5y=3.3 {{
6y+3x=19 0.1x+0.9y=1