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20/2+t=400
We simplify the equation to the form, which is simple to understand
20/2+t=400
We move all terms containing t to the left and all other terms to the right.
+1t=+400-10
We simplify left and right side of the equation.
+1t=+390
We divide both sides of the equation by 1 to get t.
t=390
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