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Carmenmaria
a fost răspuns

Calculati:
a). 2 × (3x+7) - 5×(2x+1)=3× (-2x +3) -7 ×(2x+1)+5
b) -2 ×(2x -5) +6 ×(3x+1) +25= 2× (2x+3) - 5×(-1x+7)

Răspuns :

Economist
a) 6x + 14 - 10x - 5 = - 6x + 9 - 14 x - 7 + 5
   - 4x + 9 = - 20x + 7
   - 4x + 20x  = 7 - 9,  16x = - 2
     x =  - 2/ 16,  x = - 1/ 8 / = supra
b) - 4x + 10 + 18x + 6 + 25 = 4x + 6 + 5x - 35
     14x + 41 = 9x - 29
     14x - 9x = - 41 - 29
     5x = - 70
     x = - 70/ 5,  x = - 14

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