How do you solve:6r+7=13+7r

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asked May 12, 2016 44.4k views

2 votes

How do you solve:6r+7=13+7r

Mathematics
middle-school

Encombe asked

by Encombe

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$6r+7=13+7r \\ -6r\ \ \ \ \ -6r \\ 7=13+r \\ -13\ \ -13 \\ -6=r$

Assaf Hershko answered May 13, 2016

by Assaf Hershko

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You need to get the r by itself on one side, with the constants (numbers without the r) on the other side.

$6r+7=13+7r\\6r-7r+7=13+7r-7r\\-r+7=13\\-r+7-7=13-7\\-r=6\\-r/-1=6/-1\\r=-6$

Mike Hildner answered May 16, 2016

by Mike Hildner

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