Question

qual é a soma de -3.(3x-42)=2(7x-52)

Answer 1

-3(3x-42) = 2(7x-52)
-9x + 126 = 14x - 104
-9x - 14x = -104 - 126
- 23x = -230
x = 230/23
x = 10

Espero ter ajudado.

Answer 2

$-3.(3x-42)=2(7x-52)\to \\\\ -9x+126=14x-104\to\\\\ -9x-14x=-104-126\to \\\\ -23x=-230\to \\\\x= \frac{-230}{-23} \to \\\\ x=10$