Question

Determinati solutiile ecuatiilor:
b)2(x+3)-5(2x+1)=12x-19
d)5(x-2)-2x+3(x+1)=6+7x
e)-3x+5+6(-x+1)=-4(x+6)
f)6(x+2)-2(2x+3)+4x=36

Answer 1

b)2x+6-10x-5=12x-19
  -8x+1=12x-19
  -8x-12x=-19-1
  -20x=-20 l (-1)..inmultesti cu -1 
  20x=20 l :20
  x=1
d)5x-10-2x+3x+3=6+7x
   6x-7=6+7x
   6x-7x=6+7
   -x=13 l (-1) inmultesti
   x=-13
f) -3x+5-6x+6=-4x-24
-3x+5-6x+6=-4x-24
-9x+11=-4x-24
-9x+4x=-24-11
-5x=-35 l (-1) inmultire 
5x=35 l :5
x=7
f) 6x+12-4x-6+4x=36
6x+6=36 l -6
6x=30
x=5
Sper ca ti-am fost de ajutor :*