3- resolva as equações
a) 4x=20
b) 7x=14
c) 3x-2.(x+1)=9
d) x-5= x - 3x+2
3 3. 6
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A ) 4x=20
4x=20
4x = 20/4
x = 5
B ) 7x=14
7x=14
7x = 14/7
x = 2
C ) 3x-2(x+1)=9
3x−2(x+1)=9
3x+(−2)(x)+(−2)(1)=9
3x+−2x+−2=9
(3x+−2x)+(−2)=9
x+−2=9
x−2=9
x−2+2=9+2
x=11
D ) x−5=x−3x+2
x−5=x−3x+2
x+−5=x+−3x+2
x−5=(x+−3x)+(2)
x−5+2x=−2x+2+2x
3x−5=2
3x−5+5=2+5
3x=7
3x=7/3
x = 7/3
4x=20
4x = 20/4
x = 5
B ) 7x=14
7x=14
7x = 14/7
x = 2
C ) 3x-2(x+1)=9
3x−2(x+1)=9
3x+(−2)(x)+(−2)(1)=9
3x+−2x+−2=9
(3x+−2x)+(−2)=9
x+−2=9
x−2=9
x−2+2=9+2
x=11
D ) x−5=x−3x+2
x−5=x−3x+2
x+−5=x+−3x+2
x−5=(x+−3x)+(2)
x−5+2x=−2x+2+2x
3x−5=2
3x−5+5=2+5
3x=7
3x=7/3
x = 7/3
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