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5 -x supra 2 minus 1 -x supra 5 =4

Răspuns :

5-x supra 2-1-x supra5 =4

10x5-x/2-10x1-x/5=10x4

5(5-x)-2(1-x)=40

25-5x-2+2x=40

23-3x=40

-3x=40-23

-3x=17

x=-17/3