Question

2x+5= 4x-2

7         15  

Answer 1

\(\frac{2x+5}{7}=\frac{4x-2}{15}\)

=> (2x + 5).15 = (4x - 2).7

=> 30x + 75 = 28x - 14

=> 30x - 28x = -14 - 75

=> 2x = -89

=> \(x=-\frac{89}{2}\)

Answer 2

\(\frac{2x+5}{7}=\frac{4x-2}{15}=>\frac{30x+75}{105}=\frac{28x-14}{105}\)

30x + 75 = 28x - 14 

=> 30x + 89 = 28x

=> 28x - 30x = -2x = 89 

=> x = 89 : -2 

x = =-44,5 

tíc nhé!