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28x=-7 I/28 -17x=19 /(-17) 11x=-11 /11
x=-1/4 x=-19/17 X=-1
Spr.2 9-17*(-19/17)=39-11 Spr.3-1(-1)-11=-22*(-1)-22
9+19=39-11 11-11=22-22
28=28 0=0
Spr.1
5*(-1/4)-17=-23*(-1/4)-24
-5/4-17=23/4-24
-18,25=-18,25