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7(8-x)+3(8-x)=60 va rog mult

Răspuns :

7(8-x)+3(8-x)=60
7+3(8-x)=60
10(8-x)=60
8-x=60:10
8-x=6
x=8-6
x=2

56-7x+24-3x=60
-7x-3x=60-56-24
-10x=-20     inmultim -1
10x=20
x=20/10
x=2