42=-21t

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Solution for 42=-21t equation:


42=-21t

We simplify the equation to the form, which is simple to understand 
42=-21t

We move all terms containing t to the left and all other terms to the right. 
+21t=-42

We simplify left and right side of the equation. 
+21t=-42

We divide both sides of the equation by 021 to get t. 
t=-2

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