Question

2x+10+x-20=90 alguém sabe resolver?

Answer 1

$3x - 10 = 90 \\ 3x = 90 + 10 \\ 3x = 100 \\ x = \frac{100}{3} \\ x = 33.333$

Answer 2

2x+10+x-20=90

2x+x=90+20-10

3x=100

x=100/3

x=33,3