Question

Resolva as equações:a) 3x-19=4+2x
b)6a+8=28+4a
c)5t-1=2t+5
d)3(a-6)=20
e)5(t-2)-(t+5)=1

Answer 1

a)3x-19=4+2x
3x-2x=4+19
x=23

b)6a+8=28+4a
6a-4a=28-8
2a=20
a=$\frac{20}{2}$ ⇒ a=10

c)5t-1=2t+5
5t-2t=5+1
3t=6
t=$\frac{6}{3} = 2$

d)3(a-6)=20
distributiva
3a-18=20
3a=20+18
a=$\frac{38}{3}$

e)5(t-2)-(t+5)=1
distributiva
5t-10-t+5=1
4t-5=1
4t=6
t=$\frac{6}{4}= \frac{3}{2}$