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-61=-5(5r-4)+4(3r-4)
We simplify the equation to the form, which is simple to understand
-61=-5(5r-4)+4(3r-4)
Reorder the terms in parentheses
-61=+(-25r+20)+4*(3r-4)
Remove unnecessary parentheses
-61=-25r+20+4+*(+3r-4+)
Reorder the terms in parentheses
-61=-25r+20+(+12r-16)
Remove unnecessary parentheses
-61=-25r+20+12r-16
We move all terms containing r to the left and all other terms to the right.
+25r-12r=+20-16+61
We simplify left and right side of the equation.
+13r=+65
We divide both sides of the equation by 13 to get r.
r=5
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