Question

Resolva cada uma das seguintes equaçoes

a)- 3x + 8= 5x + 16
b) x - 4 +5x= 4x +8
c) 25 - 3a + 2= -2a + 17
d) 14r + 24= 10r + 2r + 30

Answer 1

Olá,

a)

-3x+8 = 5x+16
-3x-5x = 16-8
-8x = 8
x = 8/-8
x = -1

b)

x-4+5x = 4x+8
x+5x-4 = 4x+8
6x-4 = 4x+8
6x-4x = 8+4
2x = 12
x = 12/2
x = 6

c)

25-3a+2 = -2a+17
25+2-3a = -2a+17
27-3a = -2a+17
-3a+2a = 17-27
-a = -10
a = 10

d)

14r+24 = 10r+2r+30
14r+24 = 12r+30
14r-12r = 30-24
2r = 6
r = 6/2
r = 3