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7+r+10+4r=57
We simplify the equation to the form, which is simple to understand
7+r+10+4r=57
We move all terms containing r to the left and all other terms to the right.
+1r+4r=+57-7-10
We simplify left and right side of the equation.
+5r=+40
We divide both sides of the equation by 5 to get r.
r=8
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