100=20-5r

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Solution for 100=20-5r equation:


100=20-5r

We simplify the equation to the form, which is simple to understand 
100=20-5r

We move all terms containing r to the left and all other terms to the right. 
+5r=+20-100

We simplify left and right side of the equation. 
+5r=-80

We divide both sides of the equation by 05 to get r. 
r=-16

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