Question

$4(2.5 - 3.5x) = 19.5 - 2.5(5 + 2x)$
розвяжи рівняння ​

Answer 1

19.5 - 2.5(5 + 2x) = 19.5 - 12.5 - 5x = 7 - 5x
4(2.5 - 3.5x) = 10 - 14x
10 - 14x = 7 - 5x
10 - 14x + 14x = 7 - 5x + 14x
10 = 7 + 9х
10 - 7 = 7 + 9x - 7
3 = 9x
3/9 = 9x/9
x = 1/3.