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-2y+20=0
-2y=-20
-y=-20/2
-y=-10
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8x+8-12x=4x-13-5x
-4x+8=-x-13
-4x+x=-8-13
-3x=-21
-x=-21/3
-x=-7
Y-3Y=-25+5
y=-20
2) 8x+8-12x=4x-13-5x
8x-12x-4x+5x=-13-8
x=21/13