Răspuns :

Biankid
pp ca sunt 2 ec. de gradul I dif..pt prima
4(x-2,5)=3,5x => 4x-10=3,5x => 4x-3,5x=10 => 0,5x=10 => x=10/0,5 => x= 20
pt a II-a ec.
7(3x-1)=2(3x+1) => 21x-7=6x+2 => 15x=9 => x=9/15 => x=3/5 = 0,6

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