Question

Resolva as equações:
a) 3x-21=0
b)4x+3= -19
c)5x+2=2x-1
d)2×-1÷5=3

Answer 1

a) 3x-21=0
3x=21
x=21/3
x=7 <---

b) 4x+3= -19
4x= -19-3
4x= -22
x= -22/4
x= -11/2 <---

c) 5x+2=2x-1
5x-2x= -1-2
3x= -3
x= -3/3
x= -1 <---

d) 2x-1+5=3
2x=3+1-5
2x=4-5
2x= -1
x= -1/2 <----

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