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1.3+r=11.15
We simplify the equation to the form, which is simple to understand
1.3+r=11.15
We move all terms containing r to the left and all other terms to the right.
+1r=+11.15-1.3
We simplify left and right side of the equation.
+1r=+9.85
We divide both sides of the equation by 1 to get r.
r=9.85
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