Question

Resolva as equações
a) x+5=8
b) x-4=3
c)x+6=5
d)x-7= -7
e)x+9= -1
f) x+28=11
g)x-109=5
h)x-39=_79
i)10=x+8
j)15=x+20
k)4=x-10
l)7=x+8
m)0=x+12
n) -3=x+10

Answer 1

São equações básicas de primeiro grau, basta inverter o sinal de todo algarismo que você passar para o outro lado do igual.

a) $x+5=8$
$x=8-5$
$x=3$


b) $x-4=3$
$x=3+4$
$x=7$


c) $x+6=5$
$x=5-6$
$x=-1$


d) $x-7=-7$
$x=-7+7$
$x=0$


e) $x+9=-1$
$x=-1-9$
$x=-10$


f) $x+28=11$
$x=11-28$
$x=-17$


g) $x-109=5$
$x=5+109$
$x=114$


h) $x-39=-79$
$x=-79+39$
$x=-40$


i) $10=x+8$
$10-8=x$
$2=x$


j) $15=x+20$
$15-20=x$
$-5=x$


k) $4=x-10$
$4+10=x$
$14=x$


l) $7=x+8$
$7-8=x$
$-1=x$


m) $0=x+12$
$0-12=x$
$-12=x$


n) $-3=x+10$
$-3-10=x$
$-13=x$


Espero ter ajudado!

Answer 2

a) x+5=8 ==> x= 8-5 ==> x = 3
b) x-4=3 ==> x= 3= ==> x = 7
c)x+6=5==> x= 5-6 ==> x = - 1
d)x-7= -7 ==> x= 7-7 ==> x = 0
e)x+9= -1==> x= -1-9 ==> x = -10
f) x+28=11==> x= 11-28 ==> x = - 17
g)x-109=5==> x= 5+109 ==> x =  114
h)x-39=-79==> x= -79+39 ==> x = - 40
i)10=x+8==> x= 10-8 ==> x = 2
j)15=x+20==> x= 15-20 ==> x =  - 5
k)4=x-10==> x= 4+10 ==> x =  14
l)7=x+8==> x= 7-8 ==> x = - 1
m)0=x+12==> x= 0-12 ==> x = - 12
n) -3=x+10==> x= -3-10 ==> x = - 13