Question

$8x - 12 = - 3$
$6x + 9 = - 7$
determine a solução das seguintes equações do primeiro grau ​

Answer 1

$\mathtt{a)}~\mathsf{8x-12=-3}\\\mathsf{8x=12-3}\\\mathsf{8x=9}\\\huge\boxed{\boxed{\boxed{\boxed{\mathsf{x=\dfrac{9}{8}}}}}}\\\mathtt{b)}~\mathsf{6x+9=-7}\\\mathsf{6x=-7-9}\\\mathsf{6x=-16}\\\mathsf{x=-\dfrac{16\div2}{6\div2}} \\\huge\boxed{\boxed{\boxed{\boxed{\mathsf{x=-\dfrac{8}{3}}}}}}$