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90=5+2t+3t^
We move all terms to the left:
90-(5+2t+3t^)=0
We get rid of parentheses
-2t-3t^-5+90=0
We add all the numbers together, and all the variables
-5t+85=0
We move all terms containing t to the left, all other terms to the right
-5t=-85
t=-85/-5
t=+17
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