4=20-r

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Solution for 4=20-r equation:


4 = 20 - r

We simplify the equation to the form, which is simple to understand 
4=20-r

We move all terms containing r to the left and all other terms to the right. 
+1r=+20-4

We simplify left and right side of the equation. 
+1r=+16

We divide both sides of the equation by 01 to get r. 
r=16

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