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27.90=20+5.50t
We simplify the equation to the form, which is simple to understand
27.90=20+5.50t
We move all terms containing t to the left and all other terms to the right.
-5.5t=+20-27.9
We simplify left and right side of the equation.
-5.5t=-7.9
We divide both sides of the equation by -05.5 to get t.
t=1.4363636363636
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