21=5x-4

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Solution for 21=5x-4 equation:


21=5x-4

We simplify the equation to the form, which is simple to understand 
21=5x-4

We move all terms containing x to the left and all other terms to the right. 
-5x=-4-21

We simplify left and right side of the equation. 
-5x=-25

We divide both sides of the equation by -05 to get x. 
x=5

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