1) 5x-7+3x=4x+9
4x=16
x=4
3) 7(2x-1)=3(x+5)
14x-7=3x+15
11x=22
x=2
2) 3x-(8x-3)= -2x+9
3x-8x+3=-2x+9
-3x=6
x=-2
4) 3(x-4)-(x+2)=2(x-7)
3x-12-x-2=2x-14
0x=-2
x=0
5)x/3-1/4=x/2+1
x/3-x/2=1+1/4
2x/6-3x/6=5/4
-x/6=5/4
-x=15/2
x=-15/2= -7,5
6) (x-4)/5 - (x-1)/2=0
2x-8-5x+5=0
-3x=3
x=-1
7) 2x-4-5x+5=6-8x+10
5x=15
x=3