Answer:
The equations (6x+42) degrees and (18x-12) degrees are congruent angles so to set up the equation, put both expressions on different sides of the equals sign. Use properties of equality to get x=4.5
Step-by-step explanation:
Your equation should be 6x+42=18x-12
Add the 12 to both sides to get 6x+54=18x
Move the 6x to the other side to get 54=12x
Then divide by 12 on both sides to get 4.5
Therefore, x=4.5.
