Wat is x? 1/2 (180-x) + (90-x) = 120

Antwoord:

#x = 40 #

Uitleg:

# => 1/2 (180 - x) + (90 - x) = 120 #

# => 180/2 - x / 2 + 90 - x = 120 #

# => 90 - x / 2 + 90 - x = 120 #

# => 90 + 90 - x - x / 2 = 120 #

# => 180 - (3x) / 2 = 120 #

# => (3x) / 2 = 180 - 120 #

# => (3x) / 2 = 60 #

# => x = 2/3 × 60 #

#=> 40#