Answer:
Vertical angle congruence theorem
0
Step-by-step explanation:
f(6)= -6×2+2×6
f(6)= -12+12 = 0
2/4
-3
3 times 6 is 18
3 times -2x is -6x
put -6x on the other side and divide 18 by -6x and you get -3
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