Question

simplifique e resolva as equações: a)3 (m+4)+8=2+m
b)6x+14+3x=2x+158-d
c)20x + 19 - 5x =7x + 31 + 2x
d)27z - 15 - 3z = 18z + 185 - 2z

Answer 1

a)3 (m+4)+8=2+m
3m+12+8=2+m
3m+20=2+m
3m-m=2-20
2m=18
m=18:2
m=9

b)6x+14+3x=2x+158-d
9x+14=2x+158-d
9x-2x+d=158-14
7x-d=144

c)20x + 19 - 5x =7x + 31 + 2x
15x + 19  =9x + 31 
15x-9x=31-19
6x=12
x=12:2
x=6

d)27z - 15 - 3z = 18z + 185 - 2z
24z - 15 = 16z + 185
24z-16z=185+15
8z=200
z=200:8
z=25