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(2t-3)^2-(t+3)(2t-3)=0
We multiply parentheses ..
-(+2t^2-3t+6t-9)+(2t-3)^2=0
We get rid of parentheses
-2t^2+3t-6t+(2t-3)^2+9=0
We add all the numbers together, and all the variables
-2t^2-3t+(2t-3)^2+9=0
We move all terms containing t to the left, all other terms to the right
-2t^2-3t+(2t-3)^2=-9
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