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If the lines on the sides or top wich ever u decide remain parallel if u draw them out and they dont touch tehn its a parallelgram sorry for the miss spellings i suck at english
Step-by-step explanation:1
If all the angles add up to 90 degrees then you can set the equation 7x-9*2x=90
Simplify
9x-9=90
Plus 9 both sides
9x=99
Divide by 9 on both sides
X=11
