42=21-3x

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Solution for 42=21-3x equation:


42=21-3x

We simplify the equation to the form, which is simple to understand 
42=21-3x

We move all terms containing x to the left and all other terms to the right. 
+3x=+21-42

We simplify left and right side of the equation. 
+3x=-21

We divide both sides of the equation by 03 to get x. 
x=-7

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