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21+4t=t+13+17
We simplify the equation to the form, which is simple to understand
21+4t=t+13+17
We move all terms containing t to the left and all other terms to the right.
+4t-1t=+13+17-21
We simplify left and right side of the equation.
+3t=+9
We divide both sides of the equation by 3 to get t.
t=3
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