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-70=7t+3t
We move all terms to the left:
-70-(7t+3t)=0
We add all the numbers together, and all the variables
-(+10t)-70=0
We get rid of parentheses
-10t-70=0
We move all terms containing t to the left, all other terms to the right
-10t=70
t=70/-10
t=-7
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