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12x-y-7
-3x-3y
-4y-6y-3y+12x=-13y+12x
2x =10
x=5
2. 8x-(4x+6y-5)-(-5y+8x-2)
2x+6y-5+5y+8x-2
10x+11y-7
a)4x+6y+8x-2=12x+6y-2
b)-3x-3y
c)-4y+6y-3y+12x=-12x-1y
nie wiem czy c i 1 jest dobrze ale powinno byc
1.x=10