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4t+6t=21-4
We move all terms to the left:
4t+6t-(21-4)=0
We add all the numbers together, and all the variables
4t+6t-17=0
We add all the numbers together, and all the variables
10t-17=0
We move all terms containing t to the left, all other terms to the right
10t=17
t=17/10
t=1+7/10
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