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3. (3p) Rezolvati in multimea numerelor intregi ecuatiile:
a) 8.x -2.(x + 9) = 3x + 27
b) 2. [7. (2x + 1) - 11] + 16 = 36
c) 2. (x + 3) + 3 · (x - 1) + 13 = 4 . (x + 5) + 19​


Răspuns :

a)8x-2x-18=3x+27
6x-18=3x+27
6x-3x=27+18
3x=45
“X=15”
b)2[14x+7-11]+16=36
2[14x-4]+16=36
28x-8+16=36
28x+8=36
28x=28
“X=1”
c)2x+6+3x-3+13=4x+20+19
5x+16=4x+39
5x-4x=39-16
“X=23”