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Step-by-step explanation:
a=45⁰(alternate interior angles)
b=180⁰-120⁰=60⁰(alternate interior angles)
c=180⁰-[180⁰-(60⁰+45⁰)]
=>180⁰-[180⁰-60⁰-45⁰]
=>180⁰-180⁰+60⁰+45⁰
=>105⁰
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