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3t(t+2)-3t^2.t=19
We move all terms to the left:
3t(t+2)-3t^2.t-(19)=0
We multiply parentheses
-3t^2.t+3t^2+6t-19=0
We add all the numbers together, and all the variables
3t^2-3t^2.t+6t-19=0
We move all terms containing t to the left, all other terms to the right
3t^2-3t^2.t+6t=19
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