Answer:
x = 15
Explanation:
If ZABC = 130º
ZABC = (6x+40)° = 130º
This equation can be rearranged to solve for x by isolating it (moving everything over to the other side).
(6x+40)° = 130º
Solve it without the degrees sign because it looks confusing.
6x+40 = 130
6x+40 - 40 = 130 - 40 (subtract 40 from both sides)
6x = 90
6x/6 = 90/6 (divide both sides by 6)
x = 15
Therefore x is 15. The degrees symbol is already included outside the bracket.