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Mathematics, 13.04.2020 22:34 leaving2020asap

What is the missing reason in step 3?
Statements
1. mZTRV=60°, mZTRS= (4x)
2. ZTRS and ZTRV are a linear pair
3. mZTRS + MZTRV=180
4. 60-4x= 180
5. 4x = 120
6. X=30
Reasons
1. given
2. definition of linear pair
3. ?
4 substitution property of equality
5. subtraction property of equality
6. division property of equality

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What is the missing reason in step 3?
Statements
1. mZTRV=60°, mZTRS= (4x)
2. ZTRS...

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