Oblicz:
7) -3+4X=-x-3
8) 7-2x=11x-4
9) -x-8=-2x-11
10) 0,7x+4=2,1x-5
11) -3x+7=4-9x
12) x+4=-9+6x
Z OBLICZENIAMI!
7)
-3+4X=-x-3
4x+x=-3+3
5x=0
x=0
8)
7-2x=11x-4
-2x-11x=-4-7
-13x=-11 /:(-13
x = 11/13
9)
-x-8=-2x-11
-x+2x=-11+8
x=-3
10)
0,7x+4=2,1x-5
0,7x-2,1x=-5-4
-1,4x=-9 /:(-1,4)
x = 90/14
x = 6 6/14= 6 3/7
11)
-3x+7=4-9x
-3x+9x=4-7
6x=-3 /:6
x = -1/2
12)
x+4=-9+6x
x-6x=-9-4
-5x=-13 /:(-5
x = 13/5 = 2 3/5
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7)
-3+4X=-x-3
4x+x=-3+3
5x=0
x=0
8)
7-2x=11x-4
-2x-11x=-4-7
-13x=-11 /:(-13
x = 11/13
9)
-x-8=-2x-11
-x+2x=-11+8
x=-3
10)
0,7x+4=2,1x-5
0,7x-2,1x=-5-4
-1,4x=-9 /:(-1,4)
x = 90/14
x = 6 6/14= 6 3/7
11)
-3x+7=4-9x
-3x+9x=4-7
6x=-3 /:6
x = -1/2
12)
x+4=-9+6x
x-6x=-9-4
-5x=-13 /:(-5
x = 13/5 = 2 3/5