Question

Exercícios :
1- Resolva as equações do 1° grau:

a) x – 9 = 21

b) x + 11 = 30

c) 5x – 5 = 40

d) 3x + 4 = 28

e) 4x – 2 = - 18

Answer 1

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$\tt a)~\sf x-9=21\\\sf x=21+9\\\huge\boxed{\boxed{\boxed{\boxed{\sf x=30}}}}\blue{\checkmark}\\\tt b)~\sf x+11=30\\\sf x=30-11\\\huge\boxed{\boxed{\boxed{\boxed{\sf x=19}}}}\\\tt c)~\sf 5x-5=40\\\sf 5x=40+5\\\sf 5x=45\\\sf x=\dfrac{45}{5}\\\huge\boxed{\boxed{\boxed{\boxed{\sf x=9}}}}\blue{\checkmark}\\\tt d)~\sf 3x+4=28\\\sf 3x=28-4\\\sf 3x=24\\\sf x=\dfrac{24}{3}\\\huge\boxed{\boxed{\boxed{\boxed{\sf x=8}}}}\blue{\checkmark}\\\tt e)~\sf 4x-2=-18\\\sf 4x=2-18\\\sf 4x=-16\\\sf x=-\dfrac{16}{4}$

$\huge\boxed{\boxed{\boxed{\boxed{\sf x=-4}}}}\blue{\checkmark}$