1/2r+20+1/4r+40=90

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Solution for 1/2r+20+1/4r+40=90 equation:


1/2r+20+1/4r+40=90

We simplify the equation to the form, which is simple to understand 
1/2r+20+1/4r+40=90

We move all terms containing r to the left and all other terms to the right. 
+2r+4r=+90-20-40

We simplify left and right side of the equation. 
+6r=+30

We divide both sides of the equation by 6 to get r. 
r=5

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