Question

EQUAÇÃO MATEMÁTICA , VALENDO 29 PONTOS
Contas:

1) - x + 40 - 30 = - 16
2) - x + 3 = - x
3) - 2 x + 80 - 86 = - 12
4) - 4 (x + 3) = - 2 x + 10
5) x + 50 - 36 = + 5 x 

Answer 1

1) $-x+40-30=-16$

$-x+10=-16$

$-x=-10-16$

$-x=-26$

$x=26$

$S=\{26\}$


2) $-x+3=-x$

$0=3$

Não há solução real.


3) $-2x+80-86=-12$

$-2x-6=-12$

$-2x=6-12$

$-2x=-6$

$x=3$

$S=\{3\}$


4) $-4(x+3)=-2x+10$

$-4x-12=-2x+10$

$-4x+2x=12+10$

$-2x=22$

$x=-11$

$S=\{-11\}$


5) $x+50-36=5x$

$5x-x=50-36$

$4x=14$

$x=\dfrac{14}{4}$

$S=\{\frac{14}{4}\}$