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64-32t+4t^{2}+64=\left(14-2t\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(8-2t\right)^{2}.
128-32t+4t^{2}=\left(14-2t\right)^{2}
Add 64 and 64 to get 128.
128-32t+4t^{2}=196-56t+4t^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(14-2t\right)^{2}.
128-32t+4t^{2}+56t=196+4t^{2}
Add 56t to both sides.
128+24t+4t^{2}=196+4t^{2}
Combine -32t and 56t to get 24t.
128+24t+4t^{2}-4t^{2}=196
Subtract 4t^{2} from both sides.
128+24t=196
Combine 4t^{2} and -4t^{2} to get 0.
24t=196-128
Subtract 128 from both sides.
24t=68
Subtract 128 from 196 to get 68.
t=\frac{68}{24}
Divide both sides by 24.
t=\frac{17}{6}
Reduce the fraction \frac{68}{24} to lowest terms by extracting and canceling out 4.