What is the answer to 6+2x=7x-9

x=3

Step-by-step explanation:

2+6=7−9

2+6(−6)=9(−6)

2=7−15

2(−7)=7−15(−7)

−5=−15

divide both sides

=3

Sample Response: Because vertical angles are congruent, angles 1 and 4 are congruent. Because corresponding angles are congruent, angles 4 and 8 are congruent. Because angle 4 is congruent to both 1 and 8, angle 1 is congruent to angle 8.