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a) 2(a+b-3c) =2a+2b-6c
b) -5x(6-3y-4z) = -30x+15xy+20xz
c) 0,1a(2a-5b+0,1c) =0,2a^2-0,5ab+0,01ac
zad:2
2x-5y+4x-10y+4 =6x-15y+4=6*(-½)-15*2/5+4=-3-6+4=-5
zad:3
a) 12x-4y+2z = 2(6x-2y+z)
b) 2/7x + 6/7y - 8/14z =1/7(2x+6y-8/2z)