1)5(x-3)+2x=4-(x-9)
5x-15+2x=4x-13
5x+2x-4x=15-13
3x=2/:3
x=2/3 sau x=0,66
2)9(2x+4)+3(6x-4)=0
18x+36+18x-12=0
18x+18x=-36+12+0
36x=-24/:36
x=-24/36
3)-8-3(x+7)+3=4(8x-1)-2
-16(x+7)+3=32x+4-2
-16x-9+3=32x+4-2
-9+3-4+2=16x+32x
-8=42x=>42x=8/:42=>x=8/42
