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Combine like terms to create an equivalent expression:-
8t+1+(-4t)+(-6)
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First, +(-4t) is the same as -4t:-
8t+1-4t+(-6)
Same with +(-6):-
8t+1-4t-6
Subtract the t's:-
4t+1-6
And finally,
4t-5
Good luck.
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