Question

1- Determine o valor de x nas equações abaixo.

x - 4 = 7 b) x + 1 = -8 c) x - 2 = -3



d) x + 6 = -5 - 2x e) x - 3 = 7 - x

Answer 1

$\Large\boxed{\begin{array}{l}\sf a)~\sf x-4=7\\\sf x=7+4\\\sf x=11\\\tt b)~\sf x+1=-8\\\sf x=-8-1\\\sf x=-9\\\tt c)~\sf x-2=-3\\\sf x=2-3\\\sf x=-1\\\tt d)~\sf x+6=-5-2x\\\sf x+2x=-6-5\\\sf 3x=-11\\\sf x=-\dfrac{11}{3}\\\\\tt e)~\sf x-3=7-x\\\sf x+x=7+3\\\sf 2x=10\\\sf x=\dfrac{10}{2}\\\\\sf x=5\end{array}}$