Solution:
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#
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Statement
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Reason
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1
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<4 + <C = 180
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Given
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2
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<4 + <5 = 180
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Sum of angles on a line
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3
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<4 + <C – (<4 + <5) = 180 - 180
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#1 - #2
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4
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<C - <5 = 0
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Simplify #3
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5
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<C = <5
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Simplify #4
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