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35x+56=14+21
35x+56=35
35x=-21 /:(35)
x=-0,6
35x=-21
35*(-0,6)=-21
-21=-21
Zgadza sie
b) -6(5-4z)-3(3z-6)=0
-30+24z-9z+18=0
-12+15z=0
15z=12 /:15
z=1,25
15z=12
15*1,25=12
18,75=12
Nie zgadza się