Question

решить уравнение 5х+30-12х=42

Answer 1

5х+30-12х=42

5х-12х=42-30

-7х=12

х=-12/7=-1цел5/7

Answer 2

$5x+30-12x=42$

 

$30-7x=42$

 

$7x=30-42$

 

$7x=-12$

 

$x=-12:7$

 

$x=-frac{12}{7}=-1frac{5}{7}$