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12-(7-3t)=-8t-30
We move all terms to the left:
12-(7-3t)-(-8t-30)=0
We add all the numbers together, and all the variables
-(-3t+7)-(-8t-30)+12=0
We get rid of parentheses
3t+8t-7+30+12=0
We add all the numbers together, and all the variables
11t+35=0
We move all terms containing t to the left, all other terms to the right
11t=-35
t=-35/11
t=-3+2/11
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