Question

sendo u=q resvolva as equações:
3x-9=9
x-5-=-7
y-6=5y+8
10x=20+9x
2x+5-x=5-3x
2m+6=m
2x+1=15
5-x-20=5x-10-7x
x+6=2-3x         

gente por favor preciso disso para amanha e urgente! ;) 

Answer 1

3x-9=9
3x= 9+9
3x= 18
x= 18/3
x= 6

x-5-=-7
x= -7 +5
x= -2

y-6=5y+8
y -5y= 8 +6
-4y= +14 (-1)
+4y = -14 
y= -14/4 ( simplificando o -14 e 4 por 2)
y= -7/2

10x=20+9x
10x -9x =20
x= 20

2x+5-x=5-3x
2x -x +3x = 5 -5
5x-x= 5-5
4x=0
x= 0/4
x=0

2m+6=m
2m -m= 6
m= 6

2x+1=15
2x = 15 -1
2x= 14
x= 14/2
x= 7

5-x-20=5x-10-7x
-x -5x +7x = -10 -5 +20
-6x +7x= -15 +20
+x= +5

x+6=2-3x 
x +3x = 2 -6
4x= -4
x= -4/4
x= -1

Answer 2

3x-9=9
3x=9+9
3x=18
x=$\frac{18}{3}$ x= 6

x-5-=-7
x= -7 +5
x= -2

y-6=5y+8
y -5y= 8 +6
-4y= +14 (-1)
+4y = -14 
y= $\frac{-14}{4}$ simplificando por 2 y= $\frac{-7}{2}$


10x=20+9x
10x -9x =20
x= 20

2x+5-x=5-3x
2x -x +3x = 5 -5
5x-x= 5-5
4x=0
x= $\frac{0}{4}$
x= 0

2m+6=m
2m -m= 6
m= 6

2x+1=15
2x = 15 -1
2x= 14
x= $\frac{14}{2}$
x= 7

5-x-20=5x-10-7x
-x -5x +7x = -10 -5 +20
-6x +7x= -15 +20
x= 5

x+6=2-3x 
x +3x = 2 -6
4x= -4
x= $\frac{-4}{4}$
x= -1

Espero ter ajudado :)