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3x-15+4y-8=
3-15+8-8=
-12
6(x-1)-2(y-1)= dla x = 1 dla y = 4
6x-6-2y+2=
6-6-8+2=
-6
(8a-6):4= dla a = 4
2a-1½=
8-1½=
6½
6*(1-1)-2*(4-1)=6-2*3=6-5=1
(8*4):4=32:4=8
Mam nadzieję, że pomogłam ; ))
6(1-1)-2(4-1)=0-6=-6
(8×4-6):4=26:4=6,5