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10-3 = 2x
2x=7 | :2
x = 3,5
2. 2x-2=7-x
2x + x = 7 + 2
3x = 9 | :3
x =3
3. 10=4-2x
10-4 = -2x
2x = -6 |:2
x = -3
4. 4(x+1)=x
4x + 4 = x
4x - x = -4
3x = -4 | :3
x = -4/3
5. 9(x+8)=9x+8
9x + 72 = 9x + 8
9x - 9x = 8 -72
0 = -64
równanie sprzeczne
6. -(4+x)=2(3-x)
-4 - x = 6 - 2x
2x - x = 6+4
x = 10
7. 4(a-1)=6(1+a)
4a - 4 = 6 + 6a
-4 - 6 = 6a - 4a
2a = -10 | :2
a = -5
8. 3(y+6)-y+2(x+9) =0
3y + 18 - y + 2x + 18 = 0
2x + 2y + 36 = 0 | : 2
x+y + 18 = 0
x+y = -18
9. 0,1x+0,2=-0,3
0,1x = -0,3 - 0,2
0,1x = -0,5 | *10
x = -5
10. 1-0,2x+-0,3x
domyślam się, że powinno być tak:
1-0,2x = -0,3x
1 = 0,1x | *10
x = 10
11.
(x-1)/6 = 1 | *6
x-1 = 6
x = 7
12.
(1-2x)/3 = 3x | *3
1-2x = 9x
1 = 11x | :11
x = 1/11
13.)
(0,6 +x)/2 = x+1 | *2
0,6 + x = 2x + 2
0,6 -2 = 2x - x
-1,4 = x