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(2/5)t-1=3
We simplify the equation to the form, which is simple to understand
(2/5)t-1=3
Reorder the terms in parentheses
( + 0.4t)-1=3
Remove unnecessary parentheses
+ 0.4t-1=3
We move all terms containing t to the left and all other terms to the right.
+ 0.4t=+3+1
We simplify left and right side of the equation.
+ 0.4t=+4
We divide both sides of the equation by 0.4 to get t.
t=10
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