Question

alguém me ajuda
c)3x-1=x
d) 11x+12=9x+13
e)x-3=o
f)x+5=11
g)5x=4x+12
h)2x=24
i)2x=-40
j) 7x=12-x
k)9x=5
l)3m=12
m)3y+1=13
n)9y-2=8y
o)3y+1=2y
p)y-9=9

Answer 1

c)
$3x - 1 = x \\ 3x - x = 1 \\ 2x = 1 \\ x = \frac{1}{2} \\ x = 0.5$

d)
$11x + 12 = 9x + 13 \\ 11x - 9x = 13 - 12 \\ 2x = 1 \\ x = \frac{1}{2} \\ x = 0.5$

e)
$x - 3 = 0 \\ x = 0 + 3 \\ x = 3$

f)
$x + 5 = 11 \\ x = 11 - 5 \\ x = 6$

g)
$5x = 4x + 12 \\ 5x - 4x = 12 \\ x = 12$
h)
$2x = 24 \\ x = \frac{24}{2} \\ x = 12$
i)
$2x = - 40 \\ x = \frac{ - 40}{2} \\ x = - 20$

j)
$7x = 12 - x \\ 7x + x = 12 \\ 8x = 12 \\ x = \frac{12}{8} \\ x = 1.5$

k)
$9x = 5 \\ x = \frac{5}{9} \\ x = 0.555556$

l)
$3m = 12 \\ m = \frac{12}{3} \\ m = 4$

m)
$3y + 1 = 13 \\ 3y = 13 - 1 \\ y = \frac{12}{3} \\ y = 4$

n)
$9y - 2 = 8y \\ 9y - 8y = 2 \\ y = 2$

o)
$3y + 1 = 2y \\ 3y - 2y = 1 \\ y = 1$

p)
$y - 9 = 9 \\ y = 9 + 9 \\ y = 18$