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2.2t+7=-1
We move all terms to the left:
2.2t+7-(-1)=0
We add all the numbers together, and all the variables
2.2t+8=0
We move all terms containing t to the left, all other terms to the right
2.2t=-8
t=-8/2.2
t=-3+1/1.5714285714286
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