Answer:
the choice A = 15
Explanation:
I hope I helped you^_^
4x+2x-12+4x+42.
ALL interior angles of a triangle ADD up to 180 degrees.
4x+2x-12+4x+42 = 180
add LIKE terms
10x+30 = 180
subtract 30 from both sides
10x = 150
divide both sides by 10
x = 15
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