Question

( 3x + 10) / ( 5x + 10 ) = 5/7

Answer 1

do cross multiplication

21x+70 =25x+50

25x-21x =70-50

4x =20

x =5

Answer 2

Answer:

x = 5

Step-by-step explanation:

$\frac{3x+10}{5x+10} = \frac{5}{7} \\= 7(3x+10) = 5(5x+10)\\= 21x + 70 = 25x+50\\= 21x-25x = 50-70\\= -4x = -20\\= x = \frac{-20}{-4}\\= x = 5$