The two-column proof below describes the statements and reasons for proving that corresponding angles are congruent. what is the missing statement for step 7?

168

step-by-step explanation:

i am pretty sure that the answer is 168

1.3

step-by-step explanation:

3x2=6   9x+6

bring down the 6 on both sides

6+6=12

12= 9x

divide by 9

12/9 =

1.3 =x

m∠a is 90°

m∠b is 40°

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