1) 10 x + 7 = 8 x -9
10x-8x=-9-7
2x=-16
x=-8
2) 20 - 3 x = 2 x - 45
-3x-2x=-45-20
-5x=25
x=-5
3) 2,7 + 1,9 x = 2 x + 1,5
2,7-1,5=2x-1,9x
1,2=0,1x
x=12
4) 13/18 x + 13 = 7/12 x +8
13/18x-7/12x=8-13
(13*2)x/36-(7*3)x/36=-5
5x/36=-5
x=-36
1) 10 x + 7 = 8 x -9
10x-8x=-9-7
2x=-16
x=-8
2) 20 - 3 x = 2 x - 45
-3x-2x=-45-20
-5x=25
x=-5
3) 2,7 + 1,9 x = 2 x + 1,5
2,7-1,5=2x-1,9x
1,2=0,1x
x=12
4) 13/18 x + 13 = 7/12 x +8
13/18x-7/12x=8-13
(13*2)x/36-(7*3)x/36=-5
5x/36=-5
x=-36