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2u - 3u = 9-5
- u = 4
u = -4
b)3-x= (-2)*x
-x - 2x = -3
-3x = -3
x = 1
c)x + 1/4 = 1/2 + 2*x
x - 2x = 1/2 - 1/4
-x = 1/4
x = -1/4
d)3*x+ 1/7 = x -1
3x - x = -1 - 1/7
2x = - 8/7
x = - 4/7
e)1 i 3/4- 3x = -3 i 1/4 - 4*x
7/4 - 3x = - 13/4- 4x
-3x + 4x = - 13/4 - 7/4
x = - 6/4
x = - 1/5
pozdrawiam ;)
2u+3u=9-5
5u=4 /:5
u=0,8
b) 3-x=(-2)x
-x+2x=-3
x=-3
c)x+1/4=1/2+2x
x-2x=-1/4+1/2
-x=1/2
d)3x+1/7=x-1
3x-x=-1-1/7
2x=-8/7 /:2
x=4/7
e)1 3/4-3x=-3i1/4-4x
-3x+4x=-7/4-13/4
x=-20/4+
x=5