-40=20(r+4)

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Solution for -40=20(r+4) equation:


-40=20(r+4)

We simplify the equation to the form, which is simple to understand 
-40=20(r+4)

Reorder the terms in parentheses
-40=+(+20r+80)

Remove unnecessary parentheses
-40=+20r+80

We move all terms containing r to the left and all other terms to the right. 
-20r=+80+40

We simplify left and right side of the equation. 
-20r=+120

We divide both sides of the equation by -020 to get r. 
r=-6

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