Question

resolva as equações
a) 11=3x+4
b)5x-20=x-76
c)7x=4x+90
d)5x-8+x-24
e)6(3+2x)=5(5x+10)=

Answer 1

a)

11 = 3x + 4
3x + 4 = 11
3x = 11 - 4
3x = 7
x = $\displaystyle \mathsf{\frac{7}{3}}$

b)

5x - 20 = x - 76
5x - x = -76 + 20
4x = -56
x = $\displaystyle \mathsf{\frac{-56}{4}}$
x = 14

c) 

7x = 4x + 90
7x - 4x = 90
3x = 90
x = $\displaystyle \mathsf{\frac{90}{3}}$
x = 30

d)

5x - 8 = x - 24
5x - x = -24 + 8
4x = -16
x = $\displaystyle \mathsf{\frac{-16}{4}}$
x = -4

e)

6(3 + 2x) = 5(5x + 10)
18 + 12x = 25x + 50
12x - 25x = 50 - 18
-13x = 32
x = $\displaystyle \mathsf{\frac{-32}{13}}$