Question

Rezolvati ecuatiile :
a) -2x+5=9-4x
b) 2xsupra3-1supra9=5supra6+x
c) 6(x+2)-8=3x+14
d) 7x-16=16+5x
e) 3(x-2)+2(x-3)=5x-12

Answer 1

1. - 2x+5=9-4x | + 4x
2x+5=9 | -5
2x=4 | :2
x=2
2. 2x/3- 1/9 = 5/6+x | -x
2x/3-x-1/9 = 5/6
2x/3-3x/3-1/9=5/6
-x/3 - 1/9 = 5/6 | +1/9
-x/3 = 5/6+1/9
-x/3 = 15/18+2/18
-x/3 = 17/18
-6x/18=17/18 | * 18 
-6x = 17
x= -17/6
3.6(x+2)-8=3x+14
6x+12-8=3x+14
6x+4=3x+14 | -4
6x=3x+10 | - 3x
3x=10| :3
x=10/3
4.7x-16=16+5x | -5x
2x-16=16 | +16
2x=32
x=16
5. 3(x-2)+2(x-3)=5x-12
3x-6+2x-6=5x-12
5x-12=5x-12 
0x=0 
x= orice numar