what is the measure of angle A will make this quadrilateral a parallelogram

angle D =7x+1 angle B=10x-23
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??????????? "measuer av angel" ???????? yu meen.. how big ?????

???????? b & d maebee=angels ??????????

if so, weer R em??????????

parallelogram...2 angels on base (left & rite ends) add up tu 180 deg

same for 2 angels at top

In fakt, if go round rim from NE start point, first 2 angels yu meet add up=180 deg
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