August 2018 2 19 Report
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a) 5x+(2x-7)-9x-(-3x+8)+20_8x=
b) -5x+(-2y+4x)-(7x-8y)-x+(2-6y)=
c) -9z-(4-3z)-8y-(-7z+8y)+(-2y-7)=


daje naj ;)
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