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4x=30-1+5
4x=34/:4
x=8,5
dlugosci bokow:
2x+1=17+1=18
x=8,5
x-5=8,5-5=3,5
b)x+4+x+4+x+4=30
3x+12=30
3x=30-12
3x=18/:3
x=6
dlugosc bokow:
x+4=6+4=10