Question

Rezolvati ecuatiile : -12x+15=-1(-4)
3^4x-2=7
3x-14=0,x€z
6(x+3)=2x, x€z
7x+6x=39,x€n

Answer 1

-12x+15=-1(-4) <=> -12x = -11 <=> x = 11/12

3^4x-2=7 <=> 3^4x = 9 <=> 3^4x = 3^2 <=> 4x = 2 <=> x = 1/2

3x-14=0,x€z <=> x apartine multimii vide

6(x+3)=2x, x€z <=> 6x+12 = 2x <=> 4x = -12 <=> x = -3 € z

7x+6x=39,x€n <=> 13x = 39 <=> x = 3 € n