t-8tz, 3tz-z, z-t class 7 algebraic expression
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t−8tz,3tz−z,z−t=t−8tz+3tz−z+z−t
=t−t−8tz+3tz−z+z
=(1−1)t+(−8+3)tz+(−1+1)z
=0−5tz+0=−5tz.
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