👤

CALCULATI :
x-2y+3y+7y=?
7x-5=2x+21


Răspuns :

x +y( -2 +3+7 ) = x +y ·8 = x +8y
7x -2x= 21 +5
5x =26            x= 26/5 
x - 2y + 3y + 7y = x + 8y
7x - 5 = 2x + 21
7x - 2x = 5 + 21
5x = 26
x = 26/5