Explanation:
A triangle will ALWAYS be 180 degrees
4. 34 + 21 = 55
180 - 55 = 125
x = 125
5. 100 + 51 = 151
180 - 151 = 29
2x + 3 = 29
2x = 26
x = 13
6. 94 + 60 = 154
180 - 154 = 26
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