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-8=5 (7r + 4) + 7 (-3r - 8)
We simplify the equation to the form, which is simple to understand
-8=5(7r+4)+7(-3r-8)
Reorder the terms in parentheses
-8=+(+35r+20)+7*(-3r-8)
Remove unnecessary parentheses
-8=+35r+20+7+*(-3r-8+)
Reorder the terms in parentheses
-8=+35r+20+(-21r-56)
Remove unnecessary parentheses
-8=+35r+20-21r-56
We move all terms containing r to the left and all other terms to the right.
-35r+21r=+20-56+8
We simplify left and right side of the equation.
-14r=-28
We divide both sides of the equation by -14 to get r.
r=2
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