Question

qual o valr do x+3=4x+8x

Answer 1

X +3 = 4x +8x
X +3= 12x
3= 11x
X= 3/11

Answer 2

$x+3=4x+8x\to \\\\ x-4x-8x=-3\to\\\\ -11x=-3(-1)\to\\\\ 11x=3\to \\\\x= \frac{3}{11}$