Question

(1)3x=21
(3)3x -3 =24
(5)2x -2 =14
(6)x -2 =2
(7) 4x =80​

Answer 1

Olá, vou te ajudar ok?

         --Equação de primeiro grau--

1)

$3x=21\\\\21/3=7\\\\\boxed{\boxed{x=7}}$

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2)

$3x-3=24\\3x-3+3=24+3\\3x=27\\\\\boxed{\boxed{x=27}}$

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3)

$2x-2=14\\2x-2+2=14+2\\2x=16\\\\16/2=8\\\\\\\boxed{\boxed{x=8}}$

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4)

$x-2=2\\x-2+2=2+2\\\\\boxed{\boxed{x=4}}$

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5)

$4x=80\\80/4=20\\\\\boxed{\boxed{x=20}}$

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Mais sobre equação do primeiro grau em:

• brainly.com.br/tarefa/41045537
• brainly.com.br/tarefa/37022871

Espero ter ajudado!