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-5(3r+9)+7(9r+2)=0
We simplify the equation to the form, which is simple to understand
-5(3r+9)+7(9r+2)=0
Reorder the terms in parentheses
+(-15r-45)+7*(9r+2)=0
Remove unnecessary parentheses
-15r-45+7+*(+9r+2+)=0
Reorder the terms in parentheses
-15r-45+(+63r+14)=0
Remove unnecessary parentheses
-15r-45+63r+14=0
We move all terms containing r to the left and all other terms to the right.
-15r+63r=0+45-14
We simplify left and right side of the equation.
+48r=+31
We divide both sides of the equation by 48 to get r.
r=0.64583333333333
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