Question

qual o valor de x:     3x=X+100+100

Answer 1

3x = x +100 +100
3x = x + 200
3x - x = 200
2x = 200
x = 200/2
x = 100

Answer 2

$3x=x+100+100 \\ 3x-x=100+100 \\ 2x=200 \\ x = \frac{200}{2} \\ \\ x= 100$