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.9t=1+t
We simplify the equation to the form, which is simple to understand
.9t=1+t
We move all terms containing t to the left and all other terms to the right.
+ 0.9t-1t=+1
We simplify left and right side of the equation.
-0.1t=+1
We divide both sides of the equation by -0.1 to get t.
t=-10
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