#I do not know how to solve. find the size of angle ABC

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blissful waspBOT
solemn anvil
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Pls give me some hints

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I use some system of linear equation stuff but i have so many errors

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x+y=105
2x+75-y=180

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2x+2y=210
2x-y=105

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y=105
x=0

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Like what?????....

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I dont think the system of linear equation got wrong.

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How is x=0??