Respostas
Explicação passo-a-passo:
a - x= 0-3. x =-3
b-23x+ +2=2 23x=2-2. = 23x=0. x = 0/23
c- 12-7+4x=25
5+4x=25
4x=25. x =25/4
d. 5x-3x=30. x= 2x= 30. x = 30/2. x= 15
e. 4x+10= 45-3x. 4x+3x=45-10. 7x=35. x =35/7. x=5
f. 5.(9+y)=20-3+6y
45+5y=17+6y
5y-6y=17-45
y=18
g. 2x. 2x+9= -30
-----+3= -10. --------------= 2x= -30-2. 2x= -32. x=-32/2
3. 3
x= -16
h. 2x
--- +2.(3+x)= 30= 2x/3+6+2x = 30 = 6x+9+36 +12x=90
3
6x-12x=90-45
-6x=45
x=45 / -6
x=-9