Question

a) 5+x+x=30
b) 5x+4x=63
c)3x+4x=49
d)5x+2x=27
e)12x+x=169
f)12x-x=421
g)4+x+3=16
h)5+x+3+x=12
i)7+x+x+4x=77

Answer 1

Olá,

Vamos lá,

A) 5+x+x=30
2x=30-5
2x=25
x=25/2
x=12,5

b) 5x+4x=63
9x=63
x=63/9
x=7

c)3x+4x=49
7x=49
x=49/7
x=7

d)5x+2x=27
7x=27
x=27/7
x=3,85

e)12x+x=169
13x=169
x=169/13
x=13

f)12x-x=421
11x=421
x=421/11
x=38,2727

g)4+x+3=16
x= 16-3-4
x= 9

h)5+x+3+x=12
2x=12-5-3
2x=4
x=4/2
x=2

i)7+x+x+4x=77
6x=77-7
6x=70
x=70/6
x=11,6667