1) 10x+7=8x-9
2x+16 = 0
2x = -16
x = -8
2) 20-3x=2x-45
-5x+65 = 0
5x-65 = 0
5x = 65
x = 13
3) 2,7+1,9x=2x+1,5
-0.1x+1.2 = 0
0.1x-1.2 = 0
0.1x = 1.2
x = 12
1) 10x+7=8x-9
2x+16 = 0
2x = -16
x = -8
2) 20-3x=2x-45
-5x+65 = 0
5x-65 = 0
5x = 65
x = 13
3) 2,7+1,9x=2x+1,5
-0.1x+1.2 = 0
0.1x-1.2 = 0
0.1x = 1.2
x = 12