Question

Rezolvati ecuatiile:a)2x+5=7+x;b)3-7x=2x+21; c)1-4x=x+16;d)7-5x=2x-7; e)7-2x=5x-14

Answer 1

a)2x+5=7     b)3-7x=2x+21                  c)1-4x=x+16      d)7-5x=2x-7     e)7-2x=5x-14
2x=7-5             3-7x=21-2                         16x=4+1           2x=7+2             5x=14+5
2x=2                3-7x=19                             16x=5                2x=9                5x=19
x=2:2                x=19+3+7                          x=16:5               x=9:2               x=19:5
x=1                   x=29                                     x=3,1              x=4,1               x=3,4
               nu sunt sigura daca-i bine!(b)
succes!

Answer 2

a)2x+5=7+x
x=7-5
x=2
b)3-7x=2x+21
-9x=21-3
-9x=18
x=18:(-9)
x=-2
c)1-4x=x+16
-5x=16-1
-5x=15
x=15:(-5)
x=-3
d)7-5x=2x-7
-7x=-7-7
-7x=-14
x=(-14):(-7)
x=2
e)7-2x=5x-14
-7x=-21
x=(-21):(-7)
x=3