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{ 6x-3y=9 /razy -1
{ x+5y=-9,5 /razy 6
{ -6x+3y=-9
{ 6x+30y=-57
33y=66
y=2
6x-6=9
x= ⁵/₂
b)
{ P=½+3= ⁷/₂
{ P+r+18
⁷/₂+r=18
r= ²⁹/₂
c)
{ m=30%=0,3
{ n+m=65
n+0,3=65
n=64,7
-19.5+5×2- -9,5
b)3,5=1/2+3
3.5+5+18
c)3/10=30procent
30+35=65