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4 (7+5 x ) = 248 + 2x

Răspuns :

rezolvare:
28+20x=248+2x
20x-2x=248-28
18x=220
x=220:18
x=12,(2)
4(7+5x)=248+2x; 28+20x=248+2x; 20x-2x=248-28; 18x=220; x=12,(2)