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77=2(5r+8)-7(5+6r)
We simplify the equation to the form, which is simple to understand
77=2(5r+8)-7(5+6r)
Reorder the terms in parentheses
77=+(+10r+16)-7*(5+6r)
Remove unnecessary parentheses
+77=+10r+16-7+*(+5+6r+)
Reorder the terms in parentheses
77=+10r+16+(-35-42r)
Remove unnecessary parentheses
+77=+10r+16-35-42r
We move all terms containing r to the left and all other terms to the right.
-10r+42r=+16-35-77
We simplify left and right side of the equation.
+32r=-96
We divide both sides of the equation by 32 to get r.
r=-3
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