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The first equation is:
Move the 3r to the left in order to leave all the terms containing r on the same side:
Take r as common factor:
Finally, divide both sides by 6 to get that r = 1.
The second equation is
Move the 2s to the left and the -6 to the right to get:
Take s as common factor
Divide both sides by 3 to get that s = 2