Question

6) Calcule o valor de x nas equações abaixo:
a) x+5 = 9
b) x+7=3
c) x-7 = 3
d) 4x = 20
e) 3x=12
f) 2x+4 = 6
g) 4x+16=4​

Answer 1

a) $x+5=9$

$x=9-5\\x=4$

b) $x+7=3$

$x=3-7\\x=-4$

c) $x-7=3$

$x=3+7\\x=10$

d) $4x=20$

$x=\frac{20}{4}$

$x=5$

e) $3x=12$

$x=\frac{12}{3}$

$x=4$

f) $2x+4=6$

$2x=6-4\\2x=2$

$x=\frac{2}{2}$

$x=1$

g) $4x+16=4$

$4x=4-16\\4x=-12$

$x=-\frac{12}{4}$

$x=-3$