Question

Resolva a equação de de 1°grau 3.(2×-5)-3=4×-8
A)S={5}
B)S={10}
C)S={2}
D)S={15}​

Answer 1

✧ Alternativa correta ''A''

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Explicação passo-a-passo :

$\\ { \large \displaystyle \sf {3.(2x - 5) - 3 = 4x - 8}}$

${ \large \displaystyle \sf {6x - 15 - 3 = 4x - 8}}$

${ \large \displaystyle \sf {6x - 18 = 4x - 8}}$

${ \large \displaystyle \sf {6x - 4x = - 8 + 18}}$

${ \large \displaystyle \sf {2x = 10}}$

${ \large \displaystyle \sf {x = \frac{10}{2} }}$

${ \large \displaystyle \sf {x = 5}}$

$\boxed{ \boxed{ \red{ { \large \displaystyle \sf { S= \left \{ 5 \right \} }} }}}$