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Marina CMI [18]
3 years ago
14

The Question is in the file below. (Khan Academy)

Mathematics
1 answer:
galben [10]3 years ago
5 0
That little squaer angle means right angle or 90 degrees

the black line and the red line cross

therefor the oposte angles are eqal measure
7x=90+x
solve
minus x
6x=90
divide 6
x=15

x=15
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