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8t+5-21=7t-6
We simplify the equation to the form, which is simple to understand
8t+5-21=7t-6
We move all terms containing t to the left and all other terms to the right.
+8t-7t=-6-5+21
We simplify left and right side of the equation.
+1t=+10
We divide both sides of the equation by 1 to get t.
t=10
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