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2r+(-5)+6r=0
We simplify the equation to the form, which is simple to understand
2r+(-5)+6r=0
Remove unnecessary parentheses
+2r-5+6r=0
We move all terms containing r to the left and all other terms to the right.
+2r+6r=0+5
We simplify left and right side of the equation.
+8r=+5
We divide both sides of the equation by 8 to get r.
r=0.625
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