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-15y=-36
2)5x-8x=-15
13x=-15
= 13x-15
3) y+3y=-5+25
4y=20
=4y+20
4) 7y-3y+2y-5y=-o
1y=-o
=1y-o
5) 8x-12x+4x+5x=-9-13
5x=-22
=5x-22
6) 5y+6y+7y-65y=-81-102
-57y=-183
-57y-183
7) 7x+x+11x+x=16+5-11+3
20x=13
= 20x+13