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-4.2=-1.4t
We move all terms to the left:
-4.2-(-1.4t)=0
We get rid of parentheses
1.4t-4.2=0
We move all terms containing t to the left, all other terms to the right
1.4t=4.2
t=4.2/1.4
t=3+8.8817841970013E-16/1.4
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