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- 5x + 3y - 6x - 13y
0,5x + 2,1y + 3,7x - 0,2y
1/3x -y -y - 2/3x
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-5x+3y-6x-13y=-11x-10y
0,5x+2,1y+3,7x-0,2y=4,2x+1,9y
a)- 5x+ 3y-6x- 13y= -11x-10y
b)0,5x+ 2,1y + 3,7x - 0,2y=4,2x+1,9y
c)1/3x -y -y- 2/3x=-1/3x-2y