Helpppppppppppppppppppp solve for x
1 answer:
Answer:
x=35
Step-by-step explanation:
Since a quadrilateral's interior angles add up to 360°, we get this:
360-85-20=360-4x+x
340-85=360-3x
255=360-3x
-105= -3x
<em>Multiply both sides by -1</em>
105=3x
3x=105
<em>Divide both sides by 3</em>
x=35
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