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8r+2(-5+3r)=-9r-7(-r-10)
We simplify the equation to the form, which is simple to understand
8r+2(-5+3r)=-9r-7(-r-10)
Reorder the terms in parentheses
8r+(-10+6r)=-9r-7*(-r-10)
Remove unnecessary parentheses
+8r-10+6r=-9r-7+*(-r-10+)
Reorder the terms in parentheses
8r-10+6r=-9r+(+7r+70)
Remove unnecessary parentheses
+8r-10+6r=-9r+7r+70
We move all terms containing r to the left and all other terms to the right.
+8r+6r+9r-7r=+70+10
We simplify left and right side of the equation.
+16r=+80
We divide both sides of the equation by 16 to get r.
r=5
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