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The sum of interior angles in a triangle are 180 degrees. Angle B and C are congruent. Angle B is twenty less than angle A. Write and solve a system of equations using substitution.
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The sum of interior angles in a triangle are 180 degrees. Angle B and C are congruent. Angle B is twenty less than angle A. Write and solve a system of equations using substitution.

User Zachary Schroeder
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Explanation:

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The sum of interior angles in a triangle are 180 degrees. Angle B and C are congruent-example-1
User Jemimah
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