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91=7(t-87)
We simplify the equation to the form, which is simple to understand
91=7(t-87)
Reorder the terms in parentheses
91=+(+7t-609)
Remove unnecessary parentheses
+91=+7t-609
We move all terms containing t to the left and all other terms to the right.
-7t=-609-91
We simplify left and right side of the equation.
-7t=-700
We divide both sides of the equation by -07 to get t.
t=100
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